15 Sep '11, 2pm

Evaporation from trees helps cool the global climate, study says #climate #trees

15 Sep 2011: Evaporation from Trees Helps Cool the Global Climate, Study Says Water that evaporates from trees and forests not only has a significant local cooling effect, but also plays a role in cooling the global climate , according to a new study by scientists at the Carnegie Global Ecology department. Reporting in the journal Environmental Research Letters, the scientists found that evaporation from trees cooled the global climate by causing clouds to form low in the atmosphere, which reflects the sun’s rays back into space. Scientists have long known that evaporation had a local cooling effect, but have been unsure of the global effect of evaporation from trees, since water vapor also acts as a greenhouse gas in the atmosphere. But Carnegie scientists devised a climate model on the impact of tree evaporation showing that the overall global impact of evaporation is to...

Full article: http://e360.yale.edu/digest/evaporation_from_trees_helps_...

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