Ed Miliband is a target for the political right; not because he’s irrelevant, but because he’s effective. The bacon sandwich gags and “Red Ed” jokes mask a deeper unease: that Mr Miliband, with his dogged insistence on science, public investment and long-term thinking, is right. Now, as energy secretary, he has delivered what he calls an exercise in “radical truth-telling” and a stark warning to MPs that rejecting climate action is a betrayal of future generations. The language, for once, isn’t overblown. It’s belated.

By highlighting the Met Office’s annual State of the UK Climate report, Mr Miliband shows that the hotter, wetter and more arduous future we feared has already arrived. Extremes are becoming the norm: the number of very hot days has quadrupled; in the last 250 years, six of the 10 wettest winter half-years have occurred in the 21st century. Britons experience this in cancelled hospital appointments, flooded homes and

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