Climate target 'is unrealistic'

23 August 2012 Last updated at 02:28 ET


By Pallab Ghosh Science correspondent, BBC News
Prof Sir Bob Watson: Leadership needed

One of the government's most senior scientific advisers has said that efforts to stop a sharp rise in global temperatures were now "unrealistic".
Prof Sir Bob Watson said that any hope of restricting the average temperature rise to 2C was "out the window".
He said that the rise could be as high as 5C - with dire consequences.
Sir Bob added the Chancellor, George Osborne, should back efforts to cut the UK's CO2 emissions.
He said: "I have to look back on [the outcome of successive

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