ITV: The UK must cut its greenhouse gas emissions by at least 34 per cent by 2020, a report has warned. The document from the Committee on Climate Change, which was set up to advise the Government, said emissions should be cut by even more if an international deal on reducing greenhouse gases is agreed. If the current UN negotiations lead to a new deal on climate change in Copenhagen next December, the UK’s greenhouse gases should be cut by 42 per cent on 1990 levels by the end of …