ClimateWire: Escaping the most severe effects of global warming will require quick, steep cuts in greenhouse gas emissions, a new government-funded study finds. Cutting emissions by 70 percent by the end of the century would cause the Earth to warm by an average of about 2 degrees Celsius, versus 4 degrees if emissions continue growing at their current rate, according to computer simulations run by researchers at the National Center for Atmospheric Research in Boulder, Colo. And that would …