Greenhouse gas levels hit record high as temperature falls

Greenhouse gas levels rose to record highs in 2007, leading to a 1 per cent increase in the overall global warming effect, the World Meteorological Organisation says. Carbon dioxide rose 0.5 per cent from 2006 to reach 383.1 parts per million, while nitrous oxide levels were up 0.25 per cent, according to latest WMO statistics. Methane, meanwhile, increased 0.34 per cent, surpassing the highest level recorded in 2003.

``Using the NOAA Annual greenhouse gas index, the total warming effect of all long-lived greenhouse gases was calculated to have increased by 1.06 per cent from the previous year and by 24.2 per cent since 1990,'' said the WMO. Carbon dioxide concentrations in the atmosphere have risen 37 per cent since the 18th century, the WMO said.

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