http://uk.oneworld.net/article/archive/8382 en_GB_uk http://uk.oneworld.net/link/gotolink/addhit/69556 This is a vital but tricky question. Most commentators seem to settle on 2.5 tonnes of CO2 emissions per year as the target we need to aim at. At COIN George Marshall argues that to be really equitable with the rest of the world, we should reduce to just two thirds of a tonne of carbon each.