Tropical Cloud Cover
The biggest wild card in forecasting the effects of global warming on temperature is the behavior of clouds. Clouds can both trap heat on the earth's surface -- and reflect the sun's radiation back where it came from. It used to be thought that the two balanced each other out, but as NPR's Richard Harris reports, two new studies in Science magazine suggest that this may not be not the case, and lead to some interesting recalculations.
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