More "settled" science not so settled after all...
Hot climate or cold, tree leaves stay in comfort zone: study
PARIS (AFP) - The internal temperature of leaves, whether in the tropics or a cold-clime forest, tends toward a nearly constant 21.4 degrees Celsius (71 degree Fahrenheit), reports a study released Wednesday.
It had long been assumed that actively photosynthesising leaves -- using energy from sunlight to convert carbon dioxide and water into sugar -- are nearly as cold or hot as the air around them.
The new findings not only challenge long-held precepts in plant biology, but could upend climate models that use tree rings to infer or predict past and present temperature changes.
Friday, June 13, 2008
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