Energy system transformations for limiting end-of-century warming to below 1.5 °C

Rogelj, Joeri; Luderer, Gunnar; Pietzcker, Robert C.; Kriegler, Elmar; Schaeffer, Michiel; Krey, Volker; Riahi, Keywan
June 2015
Nature Climate Change;Jun2015, Vol. 5 Issue 6, p519
Academic Journal
Many impacts projected for a global warming level of 2 °C relative to pre-industrial levels may exceed the coping capacities of particularly vulnerable countries. Therefore, many countries advocate limiting warming to below 1.5 °C. Here we analyse integrated energy-economy-environment scenarios that keep warming to below 1.5 °C by 2100. We find that in such scenarios, energy-system transformations are in many aspects similar to 2 °C-consistent scenarios, but show a faster scale-up of mitigation action in most sectors, leading to observable differences in emission reductions in 2030 and 2050. The move from a 2 °C- to a 1.5 °C-consistent world will be achieved mainly through additional reductions of CO2. This implies an earlier transition to net zero carbon emissions worldwide, to be achieved between 2045 and 2060. Energy efficiency and stringent early reductions are key to retain a possibility for limiting warming to below 1.5 °C by 2100. The window for achieving this goal is small and rapidly closing.


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