The countries of the "Global North" (all countries of Europe, North America and the developed regions of Asia), representing 14 % of the world's population, are responsible for 92 % of cumulative CO2 emissions in the period 1850 - 2015 . led humanity to transcend one of the planetary boundaries. However, it is the countries of the southern hemisphere that will suffer more from the effects of climate change, the authors showed by combining disease risks calculated by the World Health Organization (WHO) with population projections. by the United Nations. The study thus maps the estimated mortality in 2050 for four causes: cases of diarrheal diseases (children under 15) and malaria linked to climate change, heat stroke (over 65); and finally malnutrition (up to 5 years).