BBC News – Greenhouse gases hit record high
In its annual Greenhouse Gas Bulletin released on Tuesday, the organisation said that carbon dioxide levels reached 391 parts per million in 2011.
The report estimates that carbon dioxide accounts for 85% of the “radiative forcing” that leads to global temperature rises.
Other potent greenhouse gases such as methane also reached record highs.
The carbon dioxide levels appear to have been rising at a level of two parts per million each year for the last 10 years – with the latest measure being 40% higher than those at the start of the industrial revolution.