Guardian: For the past two years I have been fretting over a mystery. Although Labour seems to have done everything possible to ensure that it stays out of office, there remains a possibility that it might form another government at some point between now and 2050. This means that its climate change bill, which will become law in the autumn, could come back to haunt it. Despite its evident flaws, this is radical and unprecedented legislation. It imposes a legal obligation on future governments to cut …