Climate Change 2007 — Impacts, Adaptation and Bulnerability: Summary for Policymakers (PDF; 561 KB)
Source: Intergovernmental Panel on Climate Change

This Assessment makes it clear that the impacts of future climate change will be mixed across regions. For increases in global mean temperature of less than 1 to 3oC above 1990 levels, some impacts are projected to produce benefits in some places and some sectors, and produce costs in other places and other sectors . It is, however, projected that some low latitude and polar regions will experience net costs even for small increases in temperature. It is very likely that all regions will experience either declines in net benefits or increases in net costs for increases in temperature greater than about 2 to 3°C. These observations re-confirm evidence reported in the Third Assessment that, while developing countries are expected to experience larger percentage losses, global mean losses could be 1-5% Gross Domestic Product (GDP) for 4oC of warming.

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