The Global Carbon Project published a study in the journal Nature Climate Change December 2 finding that the likelihood of limiting global temperature rise to the international goal of 2 degrees Celsius is diminishing. The report, “The Challenge to Keep Global Warming Below 2 °C” concludes that keeping the temperature increase below that goal is likely to require using technologies that remove CO2 from the atmosphere. CO2 emissions rose 3 percent in 2011, to 9.5 billion MT, and are projected to increase by 2.6 percent by the end of this year. Emissions grew at an average annual rate of 3.1 percent from 2000 to 2011. If current trends continue, the global mean temperature is likely to increase by more than 5 °C in 2100.