As politicians blatantly fail to find ways of limiting climate change to a warming of no more than two degrees C, scientists are beginning to think about what will happen if and when the average temperature rises by four degrees or more, which may in fact happen as early as the 2060s.
Not all effects are likely to just double from a two-degrees world. Some, including the predicted displacement of people, may take on a very different (meaning catastrophic) quality.
Read my news feature in the latest issue of Current Biology:
Researchers ponder a 4C temperature rise
Current Biology, Volume 20, Issue 24, R1052-R1053, 21 December 2010
summary and free access to pdf file