Planet Set to Reach CO2 Threshold in 30 Years, Researchers Say

Only 1.2 trillion metric tons of carbon dioxide can be emitted in the future if nations are to avoid causing the

Enlarge

Global CO2 emissions
global mean surface temperature to rise more than 2 degrees C beyond the pre-industrial average, according to researchers with the Global Carbon Project. Combined historical and future carbon dioxide emissions must remain below 3.2 trillion metric tons to have a 66-percent chance of keeping that temperature increase below 2 degrees C — the internationally accepted benchmark for restraining global warming. But two-thirds of this allotment has already been emitted, and at the current pace of emissions, the global population will burn through the rest within the next 30 years, the researchers conclude. CO2 emissions rose 2.3 percent in 2013 and are on track to increase by 2.5 percent in 2014, according to the report, which was released ahead of this week’s UN climate summit.