Do trees keep the planet cool, or do they warm it up? I'm sure most people would say that the answer is obvious, but scientists are not so sure. Take a look at this article which suggests they do keep us cool, and then contrast it with this one by a different group of scientists which suggests the opposite.
This is an example of the way science works with lots of different research reaching apparently contradictory conclusions. On the question of the role of CO2, however, only one conclusion seems to be acceptable.
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