How? It's surprisingly simple. Turns out, demand for trees in neighborhoods behaves a lot like a luxury item, as opposed to a basic necessity.
Tim De Chant at The Per Square Mile blog wrote about research on this a couple of weeks ago. Then, he went out and found examples, using images from Google Earth.
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Fifty years of weather have worn it down, but this image depicts the first advertisement visible from space, the Readymix logo. KFC tried to claim in 2006 that their one square mile Colonel Sanders portrait in Nevada was the "world's first brand visible from outer space", but the bloggers at Google Sightseeing dispelled that myth. NPR has a slideshow of "astrotisements" from the Google Sightseeing site.
"What On Earth? Art And Ads That Can Be Seen From Space