Levels of climate-warming greenhouses gases rose to record highs in 2007, leading to a 1% increase in the overall warming effect, the World Meteorological Organization said Tuesday.
Carbon dioxide rose 0.5% from 2006 to reach 383.1 parts per million, while nitrous oxide levels were up 0.25%, according to latest WMO statistics.
Methane meanwhile increased 0.34%, 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% from the previous year and by 24.2% since 1990," said the WMO.