In the last few years, the Portuguese ecosocialist collective Climaximo has been one of the most dynamic and creative parts of the European climate movement. Two years ago, the group made a sharp shift in its strategy and tactics, declaring that ‘the governments and the corporations declared war against the people and the planet’. All In: a revolutionary theory to stop climate collapse, written by two Climaximo activists, Mariana Rodrigues and Sinan Eden, is an explanation of the Climaximo approach and a call to action. It’s an unusual book. You may find parts hard to follow. You’ll almost certainly find that it includes things you disagree with. I don’t think the authors will mind that. What they are concerned to do is to win a case for their key propositions about the problems we face and what is to be done.