The National Arbor Day Foundation has a simple app on its website that allows visitors to see how a city changes as it adds tree cover and other vegetation. Using a little sliding tool, one can gradually change the illustration from one with few trees to one with abundant trees. The difference is striking: everyone I know would prefer to live in the greener city.
I love the Arbor Day app, but this is not a new subject for me. I have long maintained that the fates of nature and cities are intricately related: Nature needs cities, a truth still not sufficiently appreciated in the world of environmental advocacy, because compact urban and suburban communities reduce development pressure on the natural and rural landscape.
