Reuters: Emission cuts pledges made by 60 countries will not be enough to keep the average global temperature rise at 2 degrees Celsius or less, modeling released on Tuesday by the United Nations says. Scientists say temperatures should be limited to a rise of no more than 2 degrees Celsius (3.6 F) above pre-industrial times if devastating climate change is to be avoided. Yearly greenhouse gas emissions should not be more than 40 and 48.3 gigatonnes of CO2-equivalent in 2020 and should …