Beechworth Sustainability

By George Monbiot, The Guardian, Tuesday 1 September 2009

Until a few months ago, government targets for cutting greenhouse gases at least had the virtue of being wrong. They were the wrong targets, by the wrong dates, and they bore no relationship to the stated aim of preventing more than 2C of global warming. But they used a methodology that even their sternest critics (myself included) believed could be improved until it delivered the right results: the cuts just needed to be raised and accelerated.

Three papers released earlier this year changed all that. The first, published in Proceedings of the National Academy of Sciences in February, showed that the climate change we cause today will be "largely irreversible for 1,000 years after emissions stop". About 40% of the carbon dioxide produced by humans this century will remain in the atmosphere until at least the year 3000. Moreover, thanks to the peculiar ways in which the oceans absorb heat from the atmosphere, global average temperatures are likely to "remain approximately constant … until the end of the millennium despite zero further emissions".

In other words, governments' hopes about the trajectory of temperature change are ill-founded.

Read the rest here: http://www.guardian.co.uk/commentisfree/2009/sep/01/global-warming-emissions-fossil-fuels