Climate milestone is a moment of symbolic significance on road of idiocy. The Guardian 20130510

http://www.guardian.co.uk/environment/georgemonbiot/2013/may/10/carbon-dioxide-milestone-climate-change
The only way forward now is back: to retrace our steps and seek to return atmospheric concentrations to around 350ppm, as the 350.org campaign demands. That requires, above all, that we leave the majority of the fossil fuels which have already been identified in the ground. There is not a government or an energy company which has yet agreed to do so.