Taking this into account, rich countries will adapt to the negative impacts of global warming and exploit the positive changes, actually creating a total positive effect of global warming worth about one-half a percentage point of GDP. However, poor countries will be hit harder. Adaptation will reduce the climate-change-related losses from 5 percent of GDP to slightly less than 3 percent, but this is still a significant negative impact. The real challenge of global warming, therefore, lies in tackling its impact on developing nations. Here, more needs to be done, above and beyond the
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