Reuters: An internationally agreed target to limit rises in global average temperatures to within 2 degrees Celsius is around double the threshold that would avoid catastrophic climate change, a study by 18 eminent scientists said.
Governments decided in 2009 that such temperature increases needed to be no more than 2 degrees C (3.6 Fahrenheit) above pre-industrial levels to avoid effects such as more extreme weather, higher sea levels and ocean acidification.
They aim to agree by 2015 on a global deal...