Carbon Is Building Up in Atmosphere Faster Than Predicted

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In 2007, carbon released from burning fossil fuels and producing cement increased 2.9 percent over that released in 2006, to a total of 8.47 gigatons, or billions of metric tons, according to the Australia-based Global Carbon Project, an international consortium of scientists that tracks emissions. This output is at the very high end of scenarios outlined by the Intergovernmental Panel on Climate Change (IPCC) and could translate into a global temperature rise of more than 11 degrees Fahrenheit by the end of the century, according to the panel's estimates.

"In a sense, it's a reality check," said Corinne Le Quéré, a professor at the School of Environmental Sciences at the University of East Anglia and a researcher with the British Antarctic Survey. "This is an extremely large number. The emissions are increasing at a rate that's faster than what the IPCC has used."

The new statistics also underscore the growing contribution to the world's "carbon budget" from rapidly industrializing countries such as China, India and Brazil. Developing nations have roughly doubled their carbon output in less than two decades and now account for slightly more than half of total emissions, according to the new figures, up from about a third in 1990. By contrast, total carbon emissions from industrialized nations are only slightly higher than in 1990.

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