A new UN treaty proposes bonuses to developing countries that don't cut down forests rich in carbon. This is helpful against climate change, and as the forests richest in carbon are tropical rainforests, it would seem to help biodiversity as well.
Actually, scientists say, it will hurt biodiversity. This is because before, with no financial incentives, countries automatically protected the areas with the highest biodiversity, which are not necessarily the same places as the places with the highest carbon content (although both are rainforests). Now, the protection will be shifted to the places with the highest global warming potential. The biodiversity hotspots will thus get the tree trunk.
http://www.sciencedaily.com/releases/2009/11/091116131714.htm
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