Guardian: Over the past 10 years, targets for cuts in CO2 emissions have crept up. Take the UK. Kyoto required a 12.5% reduction from 1990 levels by 2012, some of which we’d already achieved when we ratified the agreement. Next, the government promised a 20% reduction by the same date. That developed into a 60% cut by 2050, which the government has now accepted may need to become an 80% reduction. George Monbiot and others have gone further, calling for a cut of more than 90% by 2050 to reflect …