This is London: Global warming is even worse than realised and may require tougher action to curb carbon emissions, Environment Secretary Hilary Benn warned today. "I think the science is getting clearer and clearer," he said in an exclusive Evening Standard interview. "We have less time to act than was thought to be the case." Mr Benn’s comments will alarm motorists already fuming at higher taxes on gas-guzzling cars. They come before tonight’s debate on the Government’s …