The level of greenhouse gases in the atmosphere is rising at a rate of 2Bn tonnes a month. To avoid the temperature of the earth going above 2 degrees C (25% likelihood), there is a definite limit variously estimated as between 1000 to 1830 Bn tonnes of CO2

At current rates of use, the lower limit of this carbon budget will be reached in four decades. In September 2009, the met offf

On top of this, we need to act before positive climate feedbacks overwhelm our ability to do so, for example through the release of large amounts of methane from melting permafrost.

For these sorts of reasons, the producer of the film 'Age of Stupid' - Franny Armstrong - is calling for a sharp drop in UK greenhouse gas production in 2010 - from the general public. Her aim? to embarass the Government. See the 10:10 website