PBS NewsHour:World Faces a Fight from Behind to Keep Up With Rising Rate of CO2 Emissions

For 18 years, the U.N. was intent on cutting global emissions to prevent a rise in the earth's average temperature of more than two degrees. But new data shows the earth is on track to reach this point of no return. Gwen Ifill talks to National Journal's Coral Davenport on the implications of rising emissions and temperatures.