inaction on climate change could lead to a continued rise in global temperatures by ranging from c to c above preindustrial levels ipcc a this would increase the severity and in some cases the frequency of extreme weather events with potentially catastrophic consequences for stable economic development human life and prosperity doing nothing could be costly equating to a permanent loss of over in average world consumption per capita oecd developing countries stand to be disproportionately affected by unabated climate change eroding development gains made to date ipcc a assessments suggest that a sizeable share of development assistance activities might be affected by climate risk with estimates ranging from to per country depending on the development cooperation portfolio in each country context when measured as a share of total official development assistance oda oecd