It's not all fun and games. Some gadgets are designed to help measure and curb energy usage, cut down on wasted paper, and clean without the need for toxic chemicals.
See also this year's:
Showcase for Socially Responsible Inventions
2008 Gadget Guide: 12 Ways to Go Green [Slide Show]
Just in time for the holidays: an electricity monitor, a water-powered clock, a light made from textiles, and more
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