Sharp rise in CO2 levels recorded
| By David Shukman BBC science correspondent |
US climate scientists have recorded a significant rise in the concentration of carbon dioxide in the atmosphere, pushing it to a new record level. 
Air samples have been taken from Colorado's Rocky Mountains
BBC News has learned the latest data shows CO2 levels now stand at 381 parts per million (ppm) - 100ppm above the pre-industrial average.
The research indicates that 2005 saw one of the largest increases on record - a rise of 2.6ppm.
The figures are seen as a benchmark for climate scientists around the globe.
The US National Oceanic and Atmospheric Administration (Noaa) has been analysing samples of air taken from all over the world, including America's Rocky Mountains.
The chief carbon dioxide analyst for Noaa says the latest data confirms a worrying trend that recent years have, on average, recorded double the rate of increase from just 30 years ago.Full story: http://news.bbc.co.uk/2/hi/science/nature/4803460.stm
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