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The Earth Has Lungs. Watch Them Breathe.

Author:  Robert Krulwich
  01/12/2016
Last Updated:  01/12/2016

What a difference a leaf makes! Well, not one leaf. We have 3.1 trillion trees on our planet—that’s 422 trees per person. If we count all the leaves on all those trees and take a look at what they do collectively to the air around us, the effect—and I do not exaggerate—is stunning. I’ve got a video from NASA. When you see it, I think your jaw is going to drop—just a little.

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