Ecological footprint or carbon footprint? Granted, these measures are likely about as accurate as a calorie counter on a treadmill*, but here's a good introduction to the varieties of online carbon-footprint calculators. Even if they're only a rough estimate, they're a good test of what we can cut back on.
*if it's warm enough to run or bike outside, avoid the treadmill. Cut down on energy use.
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Here is an interesting, and often overlooked, way of reducing one's carbon footprint. Eat less meat.
http://news.cincinnati.com/article/20090202/NEWS0108/902020308/1055/NEWS
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