From AIT in the Classroom: A series of lessons designed for science classrooms as a companion to the documentary An Inconvenient Truth, “Reproducible # 4”:
The Arctic Ocean could be ice free in summer by 2050.8
8 Arctic Climate Impact Assessment. 2004. Impacts of a Warming Arctic. Cambridge, UK: Cambridge University Press. Also quoted in Time Magazine, Vicious Cycles, Missy Adams, March 26, 2006.