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If you'd like a guilt trip about just how much harm you're doing to the planet, Yahoo has got just the thing.
Today they're launching a campaign called Be a Better Planet, which aims to find the greenest city in America (geographers take note...America is now the entire planet) and provide that city with a fleet of hybrid taxis. The promo ties in Yahoo services like Yahoo Answers, and they're launching a site called Yahoo Green, which aims to be a hub for all things green.