USA Today: A rapid shift to less-polluting energy will be needed to avoid catastrophic global warming, because global emissions of heat-trapping greenhouse gases have accelerated to unprecedented levels, the United Nations reports today.
These emissions -- largely from the burning of oil, gas and coal -- grew more quickly between 2000 and 2010 than in any of the three previous decades and will need to be slashed 40% to 70% by mid-century and almost entirely by century's end to keep global temperatures from...