Lethal temperatures ​and wildfires have exposed a widening gulf between voters demanding ​action and politicians unwilling to confront the long-term choices global heating requires• Don’t get This Is Europe delivered to your inbox? Sign up hereThe climate crisis means “we’re going to have to change everything – the way we live, the way we produce, the way we trade,” France’s veteran radical-left firebrand, Jean-Luc Mélenchon, told the summer congress of his France Insoumise pa