Hundreds of U.S. cities are angling for the title of the nation's greenest.
The weapons against global warming and greenhouse gases? For a problem so complex, the answers are so simple.
We always knew what works: Recycling, rooftop gardens, green construction and administration of buildings, tree planting, reducing automobile use, and biodiesel use (or better yet, plain old vegetable grease--it's the golden key).
Also noteworthy: It turns out that local economies benefit hugely from its ecologically-sensitive action.
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