The debate on climate change has shifted dramatically in recent years. There is now unequivocal scientifi c evidence – summarised in the 2007 report from the Intergovernmental Panel on Climate Change (IPCC) – that global warming is happening; that human actions are responsible; and that this poses an enormous threat to life on Earth. Politicians, businesses and the public are increasingly aware of the problem and are calling for urgent action to cut the man-made emissions of greenhouse gases (GHGs) that cause climate change, in particular carbon dioxide (CO2)
