Authors of key climate report struggle to explain global warming lull

By Karl Ritter

Associated Press

Published: Thursday, Sept. 19 2013 9:49 a.m. MDT

The IPCC draft report says it's "extremely likely" that human influence caused more than half of the warming observed since the 1950s, an upgrade from "very likely" in the last IPCC report in 2007.

The panel also raised its projections for sea level rise to 10-32 inches (26-81 centimeters) by the end of the century. The 2007 report predicted a rise of 7-23 inches (18-59 centimeters).

Continued carbon emissions at or above current rates "would induce changes in all components in the climate system, some of which would very likely be unprecedented in hundreds to thousands of years," the IPCC said in the draft. A final version will be presented at the end of the panel's meeting in Stockholm next week.

The IPCC's conclusions are important because they serve as the scientific underpinnings of U.N. negotiations to rein in emissions of CO2 and other greenhouse gases. A global climate treaty is supposed to be adopted in 2015.

AP Science Writer Seth Borenstein in Washington contributed to this report.

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