The alternative futures
We identify the following four drivers of a growing offshore Blue Economy that will determine how developments evolve (Fig. 2 and Table S1). Firstly, Governance will guide decision making over common marine resources (Haward and Vince 2008; Campbell et al. 2016; Haas et al. 2020). Secondly, Research and Innovation will influence the nature and scope of offshore developments and their ability to address global issues (e.g. pollution and climate change; Rockström et al. 2017; Vince and Hardesty 2017). Thirdly, (instrumental and intrinsic) Values of the Oceanwill influence social preferences around offshore development (Jamieson 2008; Gee 2010; Bidwell 2017). Finally, Partnerships between economic sectors and between nations, along with institutions regulating developments, will determine investment strategies and the degree of knowledge being shared (Campbell et al. 2016; Bebbington et al. 2019; Bennett et al. 2019; Laffoley et al. 2019). These drivers, or facilitating mechanisms, interact with each other. For example, decision making around environmental sustainability could incentivise the development of new clean technologies and implement evidence-based co-management arrangements (Armitage et al. 2009).
As positive changes and interactions between these drivers enable sustainable development, the offshore Blue Economy has the potential to contribute to multiple SDGs (High Level Panel for a Sustainable Ocean Economy 2019). It has the greatest potential to contribute to SDG 7 (Affordable and Clean Energy), SDG 8 (Decent Work and Economic Growth), SDG 9 (Industry, Innovation and Infrastructure), SDG 12 (Responsible Consumption and Production), SDG 14 (Life Below Water), SDG 16 (Peace, Justice and Strong Institutions) and SDG 17 (Partnership for the Goals) (see Fig 2 and Table 1 for a description of the alternative futures in relation to drivers and SDGs; see Table S1 for more details). The offshore Blue Economy also plays a key role in meeting SDG 2 (Zero Hunger), SDG 10 (Reduced Inequalities) and SDG 15 (Climate Actions), but see Farmery et al 2020, Alexander et al 2020 and Trebilco et al 2020 for a thorough consideration of these topics in the context of the Future Seas special issues.
1. Business as usual
In the business as usual future the growth oriented economic model continues to emphasise profit and GDP growth, the commodification of nature, the dominance of private over public and cultural interests, and the prioritisation of the interests of current over future generations (Carmody 2012). Economic growth is centred in high-income, high-consumption countries. Low-income countries face many social and economic barriers in transitioning to sustainability, and this often results in unrestricted and unsustainable resource extraction (Jamieson 2008). Alternative economic models, such as well-being, degrowth, and the circular economy are attracting increasing recognition as being necessary to achieve the SDGs (Hadjimichael 2018; Schroeder et al. 2019; Ertör and Hadjimichael 2020), but their implementation remains marginal. For instance, the circular economy, where excessive waste generation is avoided and unavoidable waste becomes a resource (Lacy and Rutqvist 2016), is selectively implemented in relation to plastic pollution and restricted aspects of food production (Table 1 and S1).
Offshore activities are corporatized and resource ownership highly concentrated. Companies are granted private or leasehold rights to access offshore resources under legal frameworks that silo development considerations. As such, opportunities to address cumulative effects are missed and ultimately conservation is undermined. Low effective corporate taxation and inadequate mechanisms for capturing and redistributing benefits mean that inequities persist, and wealth is further concentrated. At the same time, the growing trend of globally sustainable and responsible investments continues to develop (Global Sustainable Investment Alliance 2018). While these investments are effective and come to dominate markets in affluent nations, they remain mostly restricted to Australia, New Zealand, Canada, Europe, UK, Japan and the United States (Global Sustainable Investment Alliance 2018). Other high-income countries, such as Singapore, Israel, South Korea and South Africa may follow suit.
Declining inshore options drives technological innovation thus advancing the capacity to operate in offshore environments. While some locations undergo a pulse of development, economically viable offshore operations for emergent industries in other locations is slower than anticipated due to the need to work in a remote, harsh and poorly understood environment. This is mirrored more broadly in the slow progress made in developing sustainable solutions for offshore areas, which is (in part) driven by the tendency of society to look to offshore alternatives only when land based solutions reach breaking point. Slow progress is also due to our failure to gain knowledge and think strategically about cumulative and intergenerational impacts (Halpern et al. 2019). The lack of societal concern is because the offshore is ‘out of sight and out of mind’ and, generally, there is poor reflection upon the values of offshore areas (Heidenreich 2016).
Monitoring and reporting requirements are fragmented and inconsistent because it is often unclear what newer industries can deliver and regulatory incentives and enforcement thus lag behind development. While smaller sectors that are in an early development stage may see benefits in information sharing, their resource monitoring and reporting capacity is small. Larger sectors are less inclined to share data due to company ownership structures and concern over losing competitive advantage (Duch-brown and Mueller-langer 2017). For example, data collected during exploration to assess the economic potential of offshore resources are rarely made readily available or are only partially shared. This prevents full cataloguing of baseline ecological functions, delays policy and regulatory development and hampers the growth of sustainable ocean business which requires this information (Durden et al. 2018; Glover et al. 2018; Jones et al. 2019; UN Global Compact 2020).
Limited data transparency and knowledge sharing means that much research and innovation occurs in isolation (Duch-brown and Mueller-langer 2017). The benefits of innovation are concentrated in a small number of countries and profitable companies and investors. Deployment of offshore renewable energy, in particular offshore wind, continues to grow, with growth rates of nearly 30% per year between 2010 and 2018 (International Energy Agency 2019). This growth is predominantly seen in the UK, EU and China. However in other jurisdictions, despite significant available resource, growth of offshore wind is less rapid. Challenges surrounding the capacity of the grid to cater for large growth in offshore generation (Business Network for Offshore Wind, 2019) or a yet to be established supply chain (Poulsen and Lima 2017) are slowing development of the industry. This leads to a patchy uptake of offshore renewables, and sub-optimal benefits in terms of decarbonisation efforts (International Energy Agency 2019).
The growing cost of deteriorating ocean health, such as the cost of plastic pollution to the tourism industry (Krelling et al. 2017), encourages greater engagement with sustainability. Other efforts to reduce environmental impact of offshore industries are encouraged by stock market related expectations, Corporate Social Responsibility reporting (Haniffa and Cooke 2005; Gjølberg 2009; Steurer 2010; Landon-Lane 2018), and the industry’s drive to attain Social License to Operate (Voyer and van Leeuwen 2019). However, quick fixes and isolated approaches result in a sizeable number of these efforts being ineffective or tokenistic (Golden et al. 2017). While international organisations look to take spatial management beyond simply “open” and “closed” areas through recognition of Other Effective Area-based Conservation Measures (OCEMs; e.g. Dudley et al 2018), the divide between affluent nations and emerging economies in the capacity to enforce zoning is evident. Moreover, politically motivated simplification of environmental regulatory constraints at national level sees sophisticated multiple use zoning degrade to ‘paper parks’ in some nations. In other nations, a policy vacuum sees slow and haphazard regulatory action around developments of new offshore industries. These patterns are slow to reverse and the resulting lack of regulatory policies factoring in the cost of environmentally damaging behaviours leads to industry continuing to use the environment as a free resource and to cynicism that the offshore Blue Economy is little more than ‘blue washing’ (Voyer and van Leeuwen 2019).
The spatial management and policy environment means offshore waters are often in effect divided into areas for production and extraction by individual sectors, and areas for conservation and protection (O’Leary et al. 2016). With a few exceptions, the spatial divisions mean that potential opportunities for co-location of industries or other bio-design inspired synergies are lost, and that the assessment of cumulative effects is compromised. Minimal investment in monitoring that is useful at a systematic scale and constrained regulatory budgets further hamper the assessment and management of impacts, leaving marine ecosystems exposed to significant risk of degradation (see also Ward et al. 2020). These limitations play out in different ways for different sectors. For seabed mining, some countries uphold moratoria in their own EEZs, as they do now (e.g. New Zealand and Namibia; Levin et al.2016; Ellis et al. 2017). Others undertake explorative mining with few provisions for rehabilitation of vulnerable marine ecosystems (Van Dover et al. 2014; Miller et al. 2018).
The value of mineral resources coupled with increasing on-land scarcity as mineral exporters retain production for domestic use sees a race to claim resource rich deposits. Countries claim Extended Continental Shelf (ECS) and expand their territorial right (EEZs) and maritime power to ensure continued access to offshore resources (Fig. 1; Tian et al. 2019; Jouffray et al. 2020). Potential for conflicts is high, particularly where resources extraction is lucrative or control over resources is strategic (Spijkers et al. 2018; Jouffray et al. 2020). This includes areas where jurisdictions are shared or under multiple competing governance structures (O’Higgins et al. 2019; Schatz 2019; Barnes and Rosello 2020), or where there is an asymmetric power distribution between countries (Choi 2017). Global naval defence spending continues to rise for two seemingly separate reasons: expansion of national political agendas and economic interests; and provision of humanitarian assistance and disaster relief. Naval activities are facilitated by artificial islands and deep-water refuelling platforms, which slowly become available to the expanding civilian offshore Blue Economy.
Without firm motivation (whether market, regulatory or societal) there is a significant risk that developments are characterised by competition and asymmetric power relations. At present the Blue Economy has great political capital and legitimacy and it has brought together diverse sets of actors from across the public, private and non-government sectors (Winder and Le Heron 2017). However, this political capital could be damaged if there is no balance between offshore development, fair redistribution of benefits and environmental protection. If expectations are not met, the public will become disenfranchised with offshore Blue Economy outcomes, which could undo any gains and compromise the offshore sector’s future.
2. More sustainable future
The more sustainable future avoids alienation of the public as the offshore Blue Economy is characterised by an intentional shift toward sustainability and equity. First, more thoughtfully balanced production, where managed growth of some sectors in balanced against de-growth of other sectors, means that the offshore economy contributes to the achievement of multiple SDGs. It ensures sustainable use of finite resources and helps reduce the risk of overshooting planetary boundaries to do with pollution, climate change and biosphere integrity (Nash et al. 2017). Second, growth of the circular economy and a reduction in consumption in high-income countries, which instead redirected their product to meet increased demand in low-income countries, helps to minimise over-exploitation of raw resources and address rising global inequities.
Offshore activity requires considerable research and development to overcome engineering and operational challenges and mitigate environmental impacts (Bailey et al. 2014; Kaldellis et al. 2016; Zanuttigh et al. 2016). A two-stage adaptive-management and precautionary principle inspired process is implemented to ensure a structured approach to offshore expansion (towards SDGs 9 and 14; Fig. 2 and table S1).
During the first stage (to 2030), government, industry, and academia collaborate to understand the impacts and implications of offshore developments (Zanuttigh et al. 2016). They design monitoring programs that support developments, provide sufficient information to inform regulatory bodies, and are affordable for emerging industries. This collaboration builds on decades of work on shared ocean observation systems (e.g. Global Ocean Observing System), development of marine spatial planning (Ehler and Douvere 2009; UNEP & GEF-STAP 2014; Dunstan et al. 2016; Jones et al. 2016; Santos et al. 2020) and integrated assessment methods (Korpinen and Andersen 2016). It benefits from offshore platform investments and R&D in Europe, US, China and Australia during the 2010s-2020s (e.g. the ENTROPI, OPEC, TROPOS and MUSICA projects). A proactive focus on cumulative effects and empirical testing of production and infrastructure technologies helps determine economic viability, social acceptability, regulatory suitability and environmental impacts (Durden et al. 2018).
During the second stage (2030 to 2040), pilot projects are evaluated to determine if and how licences for commercial developments should be issued, continued or expanded. The assessment is based on data from monitoring programs that are administered under protocols building off the FAIR data principles (Wilkinson et al 2016). It considers trigger points for management intervention that are conservative and acknowledge uncertainty (Copping et al. 2016). While pilot projects mean a precautionary approach is taken, the potential for path dependence is minimised by casting a wide net for different possible technologies and development types.
Governments ensure equitable use of offshore resources (Bennett et al. 2019) with developments predicated on need and sited for maximum positive and synergistic outcomes (contributing to SDGs 8, 12, and 16). Developments are informed by transparent and strategic planning processes that include large scale marine spatial planning and systematic ecological and socioeconomic assessments such as those being developed for multi-use offshore platforms and based on social acceptance, social cost-benefit and multi-criteria decision analyses (Chen et al. 2014). In the short term, this means government incentivises research collaboration and encourages private sector investment with some government investment directly into major infrastructure and capacity building. Over time, with adequate policies and mechanisms in place for equitable benefits sharing (Cisneros-Montemayor et al 2019; Bateman & Mace 2020), the private sector may adopt the operating standards of government enterprises. Monitoring of developments and lease and licencing arrangements is through national and international institutions, and government regularly reviews and updates the sectoral operating requirements and fee structure. Fees are also used to capture economic rents that can be used to relieve poverty, improve health and well-being, and education (Lehmann et al 2018).
Greater environmental consciousness, at both the individual and societal level, is reflected in consumer choices, planning, and other governance processes. Demand for environmentally friendly operations and products thus increases (contributing to SDGs 12 and 14) (e.g. Lim et al.2018; Hilger et al. 2019). Some jurisdictions apply economic penalties to marine products that are not produced sustainably, while in other locations societal norms see demand for those products decreasing. At a deeper level, there is a growing recognition that the instrumental values of the ocean are at risk if environmental values are not maintained, and that societal costs are associated with environmental degradation. Technological innovations allow for informed personal choices on a day-to-day basis and facilitate the engagement with participatory processes (either consultative or active participation). This drives a shift to more actively maintaining environmental values, recognising that a healthy and prosperous society is supported by healthy ecosystems (Nash et al. 2020b).
Social and environmental responsibility drives more cost effective private sector engagement with SDGs and sustainability (in particular SDG 9, 12 and 14). Shareholder dividends account for environmental externalities which drives competition in the private sector to address sustainability concerns. Standard auditing practices require businesses to explicitly show externalities, sustainability, carbon and biodiversity loss accounting in annual reporting. Their contribution is measured against wellbeing and environmental stewardship (not just GDP). Investors increasingly look to these credentials to choose investment options (Global Sustainable Investment Alliance 2018; UN Global Compact 2020). By 2030 ethical and sustainable investments are standard practice in more affluent nations and dominate the investment market globally. Systems of national environmental accounts are integrated into political decision making alongside economic forecasts, and regularly include non-monetary and indirect ecosystem flows and function (Bateman & Mace 2020).
Offshore industry is encouraged to collaborate on, and share investment in, research and innovation and infrastructure (contributing to SDGs 7, 9, 14 and 17). Collaboration allows for faster innovation and delivers efficient technology that ensures real-time monitoring and minimises ecological impact for multi-use offshore platforms (Zanuttigh et al. 2016) without compromising the functionality of the infrastructure. These innovations include bio-design of physical platforms and the adoption of advanced composite materials that use chemical and nano-scale properties to inhibit biofouling organisms. Innovation also aims for zero waste generation and carbon neutral (or even negative) footprints (Rockström et al. 2017) and provides support for regenerative practices, such as waste removal or habitat restoration in areas impacted by past damaging activities (Duarte et al. 2020). Increased production and uptake of offshore renewables, innovation in energy storage systems, and co-location of renewable production with other sectors (Rockström et al. 2017) achieves decarbonisation (see also Trebilco et al. 2020). By 2030 offshore aquaculture is a major carbon sequestration industry (Buck et al. 2017; Sondak et al. 2017) and source of bioenergy (Roesijadi et al. 2008).
There is careful consideration of the impacts of oceanic infrastructure and decommissioning issues (in line with SDGs 14 and 17) (Bennettet al. 2019; Jouffray et al. 2020). This is both with respect to policy positions and within integrated life-cycle assessments (Stuiver et al. 2016). Cooperation between government, society, industry, and academia leads to agreed and evidence-based measures for marine environmental protection (e.g. Stuiver et al. 2016). Management intervention is based on threshold levels that are most effective. For instance, priority restoration opportunities and conservation protection (e.g. in corridors, feeding areas, upwelling zones and breeding grounds) is given to taxonomic groups for which migration and dispersal patterns are known.
High resolution scientific data are widely available and shared across sectors and countries (contributing to SDGs 9, 14 and 17). This is consistent with the United Nation Ocean Compact guidelines for growing sustainable ocean business. These guidelines stress the need for industry to actively support and participate in ocean mapping initiatives and to share existing ocean data (UN Global Compact 2020). The Global Ocean Observing System provides a platform where ocean data can be shared and integrated. This platform comes at a cost, estimated to be roughly from USD 500 million to 1 billion per year (Claudet et al. 2020), but the benefits are cross-sectoral. Efficient information sharing supports integrated ocean management, speeds up innovation, and encourages learning (e.g. Winther et al 2020). It reduces the individual costs of socioeconomic assessments, Environmental Impact Assessments and planning processes, and can accelerate action and sustainable solutions. For example, accurate estimates on the environmental cost of activities become available as more companies report their performance on carbon and plastic management (UNEP 2014; Beaumont et al. 2019). These estimates show that, for the first time in 10-15 years, global marine environmental degradation costs drop below USD 13 billion per year (UNEP 2014) as a direct result of a reduction in pressure on inshore waters and a structured and sustainable approach to moving activities offshore.
Cooperation between international institutions and governments helps shift the geopolitical emphasis to sustainable use of shared offshore resources (towards SDG 16). Naval military expenditure initially remains high (Tian et al. 2019), but then slows after naval modernisation by the world’s major naval powers. The tension that both motivated and resulted from the modernisation, reduces over time as geopolitical processes increasingly support conflict resolution and shared management. In addition, a move away from fossil fuels reduces interest in the oil rich reserves of the South China Sea. Capital investments by powerful nations focus on a small number of high-tech mobile platforms that also support data streams for monitoring, reporting and compliance around offshore activities and have the potential to benefit humanitarian relief efforts. For example, mobile platforms may help establish secure and reliable communication networks in disaster zones, or act as offshore rescue and aid stations.
Global collaborations are fostered by the shared need for technological innovation, integrated monitoring, and recognition that offshore developments can address multiple SDGs (in line with SDG 17). Cooperation and knowledge sharing between land-based, coastal and offshore industries leads to a more accurate assessment of the cumulative impacts arising from the interaction between land and marine processes and encourages effective governance structures (Boschetti et al. 2020). Societal expectations around the development of new opportunities, sustainability, and equity are met. People are proud to be a part of this future.
Pathway towards a more sustainable offshore Blue Economy
1. Required changes
Achieving our vision of a more sustainable future in 2030 will require four important changes. The first is a shift in the expression of societal values towards sustainable consumption and production, and environmental justice and consciousness (e.g. shared costs and benefits of ocean use across uses, nations and generations). The Bruntland definition of sustainable development (1987) captures the generational dimension of this, where “sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs”. But this definition can be paraphrased to capture also the current user and nation dimensions, where sustainable development is development that meets our own needs without compromising the needs of other users and nations. This involves working with communities to understand how different values may compete or interact and what may be preventing sustainable or equitable actions.
The second change is that the scale and allocation of funding to offshore Blue Economy activities are appropriate and ensure long-term sustainable and equitable financing. The third change is that information sharing between industries and across nations is enhanced and the focus shifts from competition to cooperation. The fourth change is that international legal and institutional mechanisms are implemented for ethical sharing of benefits, sustainable exploitation and conflict resolution (see also Smith et al. 2020). This also means that minority and often marginalised groups, such as Indigenous and Traditional Peoples, are included in offshore Blue Economy planning processes and contribute knowledge on sustainable practices and ways of life, in line with international instruments (e.g. UN Declaration on the Rights of Indigenous Peoples) (Fischer et al. 2020).
In the next sections we discuss specific actions needed to achieve the four required changes (Fig 3). Actions are numbered and numbers refer to Table S2, where more details on each action and its relation to drivers, SDGs and the sustainable future are given.
Some of the actions we propose are applicable across different challenges and systems, but they are particularly relevant in achieving a sustainable offshore Blue Economy. Historical and current trajectories for land and coastal systems show that often these actions have not been proactively undertaken to the extent needed (e.g. Caswell et al. 2020). This has resulted in over-industrialisation and depletion, which are conditions difficult to reverse. In contrast, the offshore Blue Economy is emerging. It offers the rare opportunity to drive development and conservation from implementation rather than having to redress past mistakes, and thus to design a future that encompass innovative concepts (e.g. SDGs, circular and balanced economies). The offshore Blue Economy also poses new challenges. Offshore waters are a remote and unknown space, thus actions applicable across systems will need to be tailored to new needs and to account for a general lack of knowledge.
        a. Shift in the expression of societal values
To shift societal values, national governments, the education sector, NGOs and industry need to work collaboratively to implement school and societal awareness and education programs (Fig 3) (Kelly et al. 2020; Claudet et al. 2020). These programs should be combined with immersive experiences that include, for example, participation in hands-on workshops and game-based training for enhanced engagement and learning (Dede 2009). They shift the public perception of offshore developments from being a distant possibility to being part of their future as custodians of the planet. They inform the public that offshore development is already happening, that offshore platforms are becoming reality, and that now is the time to steer industries in a desired direction. They demonstrate that the instrumental values of offshore areas are not indefinitely resilient and that ‘out of sight’ must not be ‘out of mind’ (Fig. 3; action No. 30 and 34 in Table S2) (Jamieson 2008).
Academia needs to increase understanding of the environment-economy-society interdependencies and sustainable actions, as this information is key in developing education programs (action 31 and 40). Education programs should focus on interdisciplinarity to allow integration of different knowledge for the diverse components of the marine environment. The current tendency to bias natural science should be avoided and true integration of social sciences should be the ultimate aim (Alexander et al. 2018, Fortunato et al. 2018). Education programs should also promote environmental justice, reduction of resource consumption and sustainable choices, and in turn create realistic social expectations about emerging offshore industries (actions 32, 36, 38 and 39) (Jamieson 2008; Ripple et al. 2019). Media that provides room for responsible reflection and respectful dialog can help facilitate this process.
A society that is supported to think critically will call for reporting and regulatory requirements that consider environmental externalities and contribution to wellbeing (actions 6 and 41). It will also raise the standards of industry’s Social License to Operate (SLO), and thus demand for greater industry transparency, social responsibility and environmental stewardship. Industry, in turn, needs to increase the focus on achieving SLO and delivering on transparency, responsibility and environmental goals (action 41). It needs to go beyond tokenism and engage with society in a collaborative and genuine manner (actions 33, 37, and 41) (Harvey and Bice 2014; Ripple et al. 2019; Voyer and van Leeuwen 2019). Innovative and responsible industries need to lead by example. For instance, innovative offshore aquaculture industries should explore Integrated Multi-Trophic Aquaculture (IMTA) and ecosystem aquaculture (Chopin 2013), given the shortcomings of many land based monocultural systems. Investors need to continue to grow ethical and responsible investments and better account for environmental impacts as part of their risk management strategies.
More generally, society, international organisations, and national governments need to reconsider legislative and policy goals and metrics, moving towards reporting a broader set of environmental and wellbeing goals and indicators (action 6) (Bennett et al. 2019). As a first step, no human (or country) should be forced to put short term interests (e.g. provide for family basic needs) ahead of long term interests (e.g. maintain the instrumental value of the ocean; Hardin 1968) (action 35). Social, institutional and political changes need to stem from collaboration between society, national governments, and international organisations to determine equitable access rights and benefit redistribution from offshore activities both within and between nations (action 3, 4 and 5) (Bennett et al. 2019). In such context, criteria to determine beneficiaries may include, for example, the community’s dependence on the ocean, distance from the ocean and cultural connection to the ocean. This is noting that any action dealing with mechanisms to support equity or with ways of achieving sustainability by adopting alternative economic models sits centrally within broader discussions, for example on environmental justice, that society has to have. Rapidly progressing these discussions in the next decade is fundamental and achievable, but reaching agreements may require longer times (see also ‘risks and path dependency of actions’).
Meanwhile, concrete actions towards more equitable Blue Economy outcomes are possible. For instance, government, academia and industry need to ensure that technological advances not only address engineering and operational solutions to offshore developments but also environmental and equity solutions. Such solutions could include innovative aquaculture and energy production systems and legislative requirements that enable smaller scale and less developed countries access to offshore developments (action 5; Stead 2019).
        b. Sustainable and equitable financing
Following deliberations, mechanisms that improve and ensure long-term sustainable and equitable financing need to be implemented (action 1) (Thiele and Gerber 2017; Jouffray et al. 2019; Laffoley et al. 2019; Ripple et al. 2019). Financial mechanisms to capture the net social benefit from developments should be progressive, with greater demands on high return and high-impact sectors (action 2). Part of the funds generated from these mechanisms need to be redirected to ensure redistribution of benefits beyond national boundaries (actions 3 and 4). This is of particular importance when moving from an EEZ and country-centric focus to globally redistributing benefits from the use of the high seas (and the Area). The remaining funds should be allocated to fair redistribution of benefits within nations (actions 1, 2, 4 and 5), research and development that support monitoring and clean, efficient, multi-sectoral offshore uses (e.g. platforms; actions 8, 10, 28 and 51), and environmental impact mitigation and rehabilitation (actions 15 and 18) (Bebbington et al. 2019; Jouffray et al. 2019; Ripple et al. 2019; Duarte et al. 2020).
Innovative financing mechanisms and supplementary sources of funds also need to be explored and put in place to speed up technological innovation and uptake (actions 19, 23-25) (Thiele and Gerber 2017; Laffoley et al. 2019; Wabnitz & Blasiak 2019; Claudet et al. 2020). Innovative financing mechanisms may include blue bond and blended finances (Thiele and Gerber 2017; Fritsch 2020). Supplementary sources of funds may include stakeholder donations and private fundraising, crowdfunding for offshore investment and installations, and contributions from large private organisations, such as internet portals investing in ocean monitoring (e.g. Google Ocean). For example, voluntary and regulatory financing frameworks that support the restoration of coastal blue carbon ecosystems, such as mangroves and seagrasses (Vanderklift et al 2019), can be extended to finance large-scale aquaculture plants that act as major carbon sequestration sites (and that generate carbon credit). The non-carbon co-benefits associated with offshore aquaculture plants, including food and bioenergy production, provide opportunity to attract investors and generate additional financial support (Vanderklift et al 2019). This opportunity is maximized when the aquaculture industry is efficiently linked to other industries, within an offshore platform context. As proposed for coastal systems, actions to generate the appropriate type and scale of financial investments include an analysis of the motivation of potential investors, the development of demonstration projects and linked risk management strategies, and a customization of the final product to meet the local environmental, socioeconomic, and regulatory context (Vanderklift et al 2019).
While the current decade will see the start of offshore development with initial emphasis primarily on food and energy systems, larger multi-use developments including offshore ports, housing and transportation hubs are being touted. However, the need to structure new growth developments that are both sustainable and within planetary boundaries (Steffen et al 2015; Nash et al 2017) has led to a rethinking of global economies (e.g. Kallis et al 2012). The offshore Blue Economy has the potential to develop and embrace emerging societal concerns of over-exploitation and inefficient use of natural resources. For example, offshore leases can be offered to operators that buy out inshore food or energy quotas and thus enhance the restoration of coastal systems. Likewise, they could be offered to operators that recycle high percentages of materials throughout the production and supply chains of their businesses.
        c. Information sharing 
To foster information sharing, international organisations, national governments, industry, and academia need to collaborate (Laffoley et al. 2019; Pearlman et al. 2019; Claudet et al. 2020), and maximise transferability through data standards (Fig 3). Shared information should be used to develop robust planning processes and Environmental Impact Assessments (action 27) (UNEP & GEF-STAP 2014; Durden et al. 2018). Data collection and sharing may require expensive technologies, such as artificial intelligence driven autonomous underwater vehicles and real time data visualisation dashboards (action 10) (Mayer 2006; Yoerger et al. 2007). Shared data should incorporate life-cycle assessment of infrastructure including the shared benefit (or impact) of co-location, the logistical and operational footprint, and information about biodiversity impacts of removal versus re-purposing (action 17). Biodiversity consideration should include biosecurity aspects, such as new infrastructures acting as an invasion stepping stone or as protected habitat for sedentary species (action 17). Sharing information should allow industry planners to make rapid and well-informed decisions and thus streamline assessment and approval processes (action 26) (Pearlman et al. 2019).
National governments and international organisations need to centrally house all publicly funded data and make it easily accessible (action 29). The costs of the data warehouse process for businesses should be recognised as legitimate business costs (i.e. deductibles) and partly covered by small purchases, where data users can access some data and functionality freely but must pay for additional aspects (action 29). The scope of international organisations that collect data on ocean economic activities, such as those for deep sea mining and transport and trade (e.g. the International Seabed Authority, the World Trade Organisation and the International Maritime Organisation), needs to be expanded to include all sectors and countries. The aim is to facilitate and regulate collection and integration of this data and, most importantly, to encourage knowledge exchange which supports integrated ocean management and innovation (action 20; Winther et al. 2020). There is a need to establish clear guidelines on how to achieve knowledge exchange while protecting Intellectual Property that are enforced by national regulators (action 21; UN Global Compact 2020; Claudet et al. 2020).
To foster collaborations across countries and industries, international organisations, national governments, and academia need to run national and international summits and support clusters of collaborators (e.g. the High Level Panel for a Sustainable Ocean Economy, and the World Ocean Council) (actions 44, 45, 47, 48). Options for web-based summits should be encouraged and remote participation seen as an opportunity for increasing or diversifying attendance while reducing carbon contribution. This has already been witnessed in many international meetings held during COVID-19 restrictions, where attendees who would normally be blocked by finances, disabilities or local commitments could attend. The opportunities for collaboration will allow players to share their lessons learned, and in particular between established and emerging sectors. They will provide a way to find hidden opportunities and financial incentives for sectors to co-develop small and large scale offshore infrastructure, such as major platforms or energy arrays (e.g. by-products of one sector may solve the needs of another sector)(actions 9, 49 and 51-53).
The commercial focus throughout the 2010s has been on large infrastructure, with little input from Indigenous and Traditional Peoples. The introduction of respect, recognition and understanding of Indigenous ways of life within the offshore Blue Economy could see a multitude of alternative options emerge (Claudet et al. 2020; Vincent et al 2020), with the potential for blending of modern manufacturing technology with traditional practices (Fischer et al. 2020).
        d. International legal and institutional mechanisms
International organisations, national governments, society, and academia need to improve, ratify, and enforce existing international agreements that promote ethical sharing of benefits and shift the geopolitical emphasis to sustainable exploitation (e.g. the Convention on Biological Diversity; UN General Assembly 1982; Bennett et al. 2019; Laffoley et al. 2019) (13 and 42). Such improved agreements should 1) include resource sharing contracts between countries; 2) set international standards around industry behaviour (e.g. sustainable food and green transport certifications; action 12 and 50); and 3) set stringent requirements on licencing arrangements for exploration and their enforcement in EEZs (action 7). Requirements should include regulations on financing mechanisms, reflect uncertainty with respect to Environmental Risk Assessments, promote economic activities with a focus on mitigation and restoration (Duarte et al. 2020), low or zero carbon emissions and energy self-sufficiency or excess production (actions 11, 15 and 16). Achieving this collaborative outcome demands high-level coordination among institutions and international agreements.
It also requires a careful consideration of power imbalances that might influence negotiations between countries and sectors (Bateman & Mace 2020; Vincent et al 2020). International and regulatory bodies for conflict resolution, such as the International Court of Justice, need to be bound by rules designated to mitigate these imbalances (action 43). Power dynamics need to be considered at multiple levels and, when possible, before they result in conflicts that require legal resolution. This includes, for example, regulating power dynamics that emerge during meetings involving several sectors with contrasting interests (e.g. Bateman & Mace 2020). Small scale examples of conflict resolution and mediation techniques are readily available, but novel approaches such as a different design of meetings that, for instance, dismantle hierarchical set ups (Colvin et al. 2016) may provide useful launch points for new approaches (action 46).
2. Key actors and time frame of actions
Achieving our vision of a more sustainable future in 2030 is a collaborative and interdisciplinary effort that see all actors playing an important part in success. It also requires a coordinated and prompt start on actions that will need to be revised and continued until or beyond 2030. There are however actors that will be more influential in implementing a specific set of actions and actions that can be implemented before others (Fig. 3). For instance, most of the actions that we propose to foster information sharing can be implemented with a short to medium time frame (before 2025), and industry and international organisations will play an important role in their achievement. An example of these actions is to increase collaboration between established and emerging sectors of the offshore Blue Economy and between these sectors and the land and coastal ones so that lessons learned can be transferred (action 48).
Similarly, most actions ensuring sustainable and equitable financing can be implemented with a medium time frame (around 2025), with national governments, industry and other investors being the key actors. Examples are to enhance economic tools on high-impact and high-income sectors and to increase financing mechanisms that support activities with clear environmental and social benefits (actions 2 and 23). Instead, actions that promote a shift in the expression of societal values can be achieved at different times during the Ocean Decade (2021-2030) but mostly fall within the medium to long term category (after 2025). Civil society and the broad education sector enable this change. Last, actions dealing with international legal and institutional mechanisms will require longer time frames (by 2030) and their realization will mostly depend on national governments and international organisations. These actions include, for example, to grant licences for economic activities in offshore waters based on equity and sustainability criteria (e.g. zero waste generation and carbon neutral footprints; Buck et al 2017; Rockström et al. 2017).
3. Risk and path dependency of actions
Business as usual is not the worst possible future. It is a future that sees improvements compared to the present situation, but that does not live up to the greater potential of the more sustainable alternative. There are risks involved in choosing a more sustainable future over business as usual. Consideration of these risks should assess whether the additional effort required in taking an action is justified; if it is a significant cost, does it lead to substantial or only marginal gain? Our pathway towards a more sustainable future does not guarantee the outcome because of potential risks along the way, but considering these risks substantially increases potential for improved outcomes.
Negotiations and deliberations on the allocation of rights and redistribution of benefits from offshore activities may lead to political polarization and conflicts (Nie 2003). Some societies may want to defend their existing rights and refuse to accept what they perceive as an unjust redistribution of rights and benefits (Jamieson 2008). Political conflicts over offshore resources may intensify once their true value becomes apparent. Countries may refuse to respect international agreements, and international bodies that are responsible for regulation may instead foster collusion. Discussions on the allocation of rights and redistribution of benefits from offshore activities may continue for decades.
Authorities may fail to agree on reporting standards or to properly enforce international and national regulations around financing mechanisms, data, and knowledge sharing. This may undermine the intent and outcome of any new regulation (Galaz et al. 2018). For example, the lack of transparency in the taxation process and use of tax havens may lead to consistent losses in tax revenues, and in turn weaken social and environmental investments (Galaz et al. 2018). Similarly, countries and industries may provide poor quality data to protect commercial interests or for political reasons. Data confidentiality (or even formats) may continue to be a barrier to data sharing and management. This may hamper collaboration and development.
International requirements on exploration and initial licencing phases to ensure a structured approach to development may instead lead to inertia, disagreement over intent and regulatory capture (e.g. through disproportionate influence of lobby groups on regulatory outcomes; Dal Bó 2006). International requirements may inadvertently reduce investment and innovation and slow uptake of technologies and research and development, ultimately resulting in path dependency and a lack of critical mass essential for involvement.
All of these represent real risks in achieving a sustainable future. The choice society faces is to take actions involving known risks towards an aspirational future or to continue down a route of least resistance that will lead to a less desirable future (business as usual).