SI 2. The energy balance model in DICE
In figure SI 2 we compare the Energy Balance Model (EBM) in DICE 2016 2R
with the response in state of the art climate system models (based on
Geoffroy et (2013) and it is this EBM that we have used when we
recalibrated the DICE model). The forcing step is 1
W/m2 in both models. For both versions of the EBM we
assume that the climate sensitivity is equal to 3.1 °C for a
CO2 doubling. As is seen in the figure, the temperature
response in DICE 2016 R2 to a forcing step is slower in the short term,
but relatively faster in the long term (after 50 years and onwards) and
approaches the equilibrium level faster than the EBM calibrated to CMIP5
climate system models. This has, as was shown in main text, large
implications for the the emissions space of CO2compatible with 2 & 2.5°C warming targets.