Monday, July 2, 2007

Local Warming

The loss of urban trees is causing some cities to start feeling the heat, according to a recent article in Time:

A high [tree] canopy prevents sunlight and heat from ever reaching the ground; by contrast, unshaded asphalt soaks up thermal energy and radiates it back, creating what is known as heat islands. In Atlanta, where developers bulldozed 380,000 acres from 1973 to 1999--much of it heavily forested--temperatures have climbed 5º to 8º higher than in the surrounding countryside, according to NASA, which studies global hydrology and climate. Scientists fear the heavily developed corridor between Boston and Washington could be the next big hot zone.

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