After categorizing, the remaining lessons with interchangeable content were merged to avoid repetition. The resulting final lessons were turned into a second survey, in which 121 non-expert participants were asked to score the relevance of the lessons to their best knowledge in regard to climate change. To validate the filtration as well as the results of survey 2, we designed a third survey and invited 31 experts to score the same lessons as in the second survey. 2.1.4 Stage 4 - Evaluation According to their scoring in survey 2 and survey 3, the final lessons were statistically evaluated. The scoring of the various categories and the countries of origin of the participants were further visualized. Additionally, the top-scoring lessons were ranked.