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Pictures: 15 great green gadgets for Earth Day

Help the planet and save cash with these tech toys

Every day is Earth Day, hard-core environmentalists will tell you, but on the calendar it's April 22. And if you want to show some support for Mother Earth, you might as well do so without abandoning your techie principles. There's no shortage of energy-efficient, ecofriendly, or generally "green" gadgets available, but here are 15 of the coolest, weirdest, and most practical, in no particular order.

Coffee-based printer

Jeon Hwan Ju's RITI Printer, which uses old coffee grounds or tea leaves instead of ink, is one of those gadget concepts that really ought to be actual products. Regular printers are annoying enough as is - I wouldn't mind going green for simple jobs.

RITI Printer

Water-powered alarm clock

It doesn't offer a fancy radio or iPod integration, but the £14 water-powered alarm clock should wake you up and wash away a bit of guilt. Just dump in some H2O, and you're good to go for three months, as the evaporation process powers the clock. Oddly enough, it isn't waterproof on the outside.

Water-powered alarm clock

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