Dependence on oil means that a 30-day blockade of the Persian Gulf would cost the US over $70bn, says the report Photograph: AP/PA

Oil use must be slashed by a third in ten years, not to save the planet — but to save the US

Just when I began to feel gloomy about the continuing challenges to the primacy, if not legitimacy, of renewables and climate change science, along comes a burst of bright, positive light — in the unlikely shape of 13 retired admirals and generals.