How do you reduce your emissions by vast amounts without costing you a penny? BP has the answer:

THE oil giant BP has been accused of creative accounting after declaring a cut of 830m tons in its annual carbon dioxide emissions — roughly equivalent to the entire output of Britain and the Netherlands combined. It has decided to exclude the oil, gas and chemicals it buys on world markets from its emission figures, and now takes responsibility only for the hydrocarbons it has itself extracted. Until 2005, BP took responsibility for about 1.4 billion tons of CO2 in documents it filed with the Carbon Disclosure Project (CDP). However, in the latest documents filed to the CDP, covering 2006, BP revised its CO2 output downwards to 570m tons — an apparent decrease of 830m tons.

Ta-daa!