Reading up on the BBC about a recent survey on soil temperatures:
Warmer soils add to climate worry
It would appear that, as the climate changes and winter's are not as cold as they used to be, the soil is slowly warming up and releasing carbon dioxide. Of course, this has a big effect on climate change calculations, which currently don't take this into consideration.
So, rather than a slow change to climate, it could be a rather more rapid one. The impact of all the extra carbon dioxide from our lifestyles is causing further carbon dioxide from the ground.
All the results are under scrutiny, but it could be a exponential problem, rather than a more linear one as first thought.
