Science aspects of the 2°C and 1.5°C global goals in the Cancun Agreements

In the international climate negotiations, long-term global targets can serve as a guideline for policy decisions on mitigation. However, under any long-term global target, the impacts of climate change are not equally distributed over countries. The evaluation of a global target for limiting global warming needs to take into account this heterogeneity and the interests of countries that take the bigger share of impacts.