The ClickClean campaign, from the Via Agency, Portland, Maine, follows an April report from Greenpeace finding little progress by Amazon, Twitter and some others toward using renewable energy to power their data centers. Dave Pomerantz, senior campaigner at Greenpeace, said those companies are using relatively little renewable power or have been reluctant to disclose where they get power.

By contrast, following a similar campaign by Greenpeace and Via two years ago, Apple pledged to get 100% of power for its servers from renewable sources, while Facebook andGoogle have made substantial progress, Mr. Pomerantz said.

You might like this chart:

http://pandawhale.com/post/40455/how-green-are-the-internets-biggest-services-greenpeace-gives-google-apple-and-facebook-great-ratings-and-amazon-web-services-notsomuch