How greenhouse gas does the IT industry generate?

“the global IT industry generated as much greenhouse gas as the world’s airlines – about 2% of global CO2 emissions” (via the times)¹

NOTES:
1) The Sunday Times, accessed April 28, 2009, http://technology.timesonline.co.uk/tol/news/tech_and_web/article5489134.ece (page no longer available)