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Google is secretive about its energy consumption and carbon footprint. It also refuses to divulge the locations of its data centres. However, with more than 200m internet searches estimated globally daily, the electricity consumption and greenhouse gas emissions caused by computers and the internet is provoking concern. A recent report by Gartner, the industry analysts, said the global IT industry generated as much greenhouse gas as the world's airlines - about 2% of global CO2 emissions. "Data centres are among the most energy-intensive facilities imaginable," said Evan Mills, a scientist at the Lawrence Berkeley National Laboratory in California. Banks of servers storing billions of web pages require power.

Quick: what was the most widely-used form of media in 2008? If you guessed Internet news sites, blogs, or social networks, you'd be way off. Network TV news (NBC, CBS, ABC) is still used by the highest percentage of adult Internet users, with local newspapers and local TV news occupying the 2nd and 3rd positions, respectively, in a recently released survey from Ketchum. While old media is still on top, the trends in the survey, which has been conducted each of the last three years, point to a familiar story: media consumption habits are quickly changing. That said, some forms of new media are performing much better than others. For example: - Blogs are now used by 24% of Internet users, up from 13% in 2006 - Social networks are now used by 26% of Internet users, up from 17% in 2006 - Videocasts are now used by 11% of Internet users, up from 6% in 2006 Slower growers include: - RSS feeds: growing from 5 to 7 percent - Podcasts: growing from 5 to 7 percent - Business news sites: flat at 8 percent