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11/25/2007

Carbon dioxide levels at record high

LEVELS of carbon dioxide, the main greenhouse gas emitted by burning fossil fuels, hit a record high in the atmosphere in 2006, accelerating global warming, the World Meteorological Organization (WMO) said.

But concentrations of methane, the number two heat-trapping gas, flattened out in a hint that Siberian permafrost is staying frozen despite some scientists' fears that rising temperatures might trigger a runaway thaw.

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