Guardian: The Department of Energy and Climate Change, responsible for promoting energy efficiency, is to sign up tomorrow to the 10:10 campaign to cut carbon emissions. Its pledge to cut its carbon emissions by 10% in 2010 comes after it emerged that the department’s headquarters in Whitehall had the worst possible energy efficiency rating on the government’s own seven-point scale. It is the second government department to sign up to the campaign, which is supported by the Guardian, after the …