For years, high-resolution photos taken by US spy satellites documented the extent and quality of arctic sea icewhich scientists consider a key indicator of climate change. But the scientists could not see the data. National security was the government's excuse. It was classified.
- "Revealed: The Secret Evidence of Global Warming Bush Tried To Hide,"  London Observer/Guardian, July 26, 2009, by Suzanne Goldenberg and Damian Carrington.
- National Academy of Sciences: Release of July 15, 2009. 
- Department of the Interior: Release of July 15, 2009.