Carbon dioxide is at record levels according to US researchers.
A report by the National Oceanic and Atmospheric Administration have revealed carbon dioxide levels are 387 parts per million – scientists believe this is the highest level for 650,000 years.
The fear amongst scientists is the continuing rise indicates the Earth is losing its ability to respond to carbon dioxide emissions.
The United Nation's Intergovernmental Panel on Climate Change co-chair Martin Parry said. 'Despite all the talk, the situation is getting worse. Levels of greenhouse gases continue to rise in the atmosphere and the rate of that rise is accelerating,
'We are already seeing the impacts of climate change and the scale of those impacts will also accelerate, until we decide to do something about it.'
Responding to the news, Greenpeace climate change campaigner Robin Oakley said: 'We're now witnessing a key moment in the climate change story and it's not good news.
'The last time the atmosphere was this choked with CO2, humans were yet to evolve as a species.
'To even consider building new runways and coal-fired power stations at this juncture in history is an unpardonable folly, but Gordon Brown seems determined to stumble forward regardless with his ill-conceived plans in the face of the science and widespread public opposition.'