The animation below is hosted on the Arbor Day Foundation website (http://www.arborday.org/media/mapchanges.cfm). But you can see it here, too. Just use the scrollbar at the bottom of the window to center the map, and you'll see the buttons necessary to run the animation.
If you scroll down while you're in the window, you'll find that you can also follow links on the Arbor Day Foundation's website through the window, but I wouldn't recommend it. If you want to explore their website, point your browser to http://www.arborday.org.
The animation is on the next page.
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