The estimated gap between proposed global emission cuts and scientifically advisable emissions levels has widened, thanks to stronger-than-expected growth from key developing countries and more accurate carbon accounting. In its "Emissions Gap Report 2012," the U.N. Environment Programme estimates that, should countries follow through on their most stringent international pledges to reduce greenhouse gas emissions, the world will still emit 8 gigatons above the 2020 limit scientists say is needed to prevent runaway global warming. Go to story #1