Confronted by new evidence of global warming, will people react like frogs?

According to an often-told story, a frog will try to jump out if you drop it into hot water but the hapless creature will stay, and eventually die, if you put it in a pan of cool water and slowly bring it to the boil.

A United Nations report to be released in Paris on February 2 will include the strongest warning yet that humans are stoking global warming that may cause colossal damage to nature if, like the doomed frog, they ignore rising temperatures.