A while ago environmentalist blogger Mark Ontkush pointed out that a white computer screen, for example an empty word document or Google's famous minimalist home page uses considerably more energy than a black one. (roughly speaking 74 watts as opposed to 59 watts depending on what kind of screen your using)
He worked out that when you look at the number of hits a page like Google gets every day, a small change could make a big difference. According to his calculations this could be around 750 mega watts a year. (sounds like a lot eh?)
You can read Mark's account of the whole story here.
Anyway, in response a whole load of black versions of the google site popped up.
Here's one of them.

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