If a Tree Falls in the Forest, and No One Is Around to Hear It, Does Climate Change?

There are roughly 42 million square kilometers of forest on Earth, a swath that covers almost a third of the land surface, and those wooded environments play a key role in both mitigating and enhancing global warming.

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<p><a href="http://www.physorg.com/news132506249.html">If a Tree Falls in the Forest, and No One Is Around to Hear It, Does Climate Change?</a></p> <p>There are roughly 42 million square kilometers of forest on Earth, a swath that covers almost a third of the land surface, and those wooded environments play a key role in both mitigating and enhancing global warming.</p>