
Not content to tell the world about sustainability, this app analyzes your carbon footprint, then gives you concrete ways to reduce it, by pledging to switch to fluorescent bulbs or a reusable water bottle. And a "carbon tree" shows how much you and your friends have reduced your footprint. Of course, unless these guys have a spy network I haven't heard about, they won't be checking your house to make sure you installed that low-flow shower head you pledged to buy last April. But for Facebook addicts thinking about their New Year's resolutions, here's a good place to start.
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