twoheadedboy writes: "Facebook has opened up on its environmental impact. Following pressure from campaign group Greenpeace last year, the social network today revealed its carbon footprint figures for the first time. The data showed that Facebook has a lower carbon footprint than Google, which produces 1.5 million tonnes of carbon annually. In 2011, the social networking giant produced 285,000 metric tonnes of CO2e (carbon dioxide equivalent, which includes greenhouse gases CO2, CH4, N2O, and hydrofluorocarbons). Greenpeace praised Facebook's move, saying it was an important milestone for the company and “for an industry that needs to be more transparent about its energy use”."