evidence: Temperatures could rise by 3C by 2050, models suggest - Published Global temperatures could rise by 1.4-3.0C (2.5-5.4F) above levels for late last century by 2050, a computer simulation has suggested. [...] People planning for the impacts of climate change need to consider the possibility of warming of up to 3C by 2050, even on a mid-range emission scenario, the researchers say.