Climate emergency demands action, not rhetoric. So, on the eve of COP26, which UK news item promises to deliver the most positive impact for the future of the planet? Not, I suggest, Sadiq Khan’s extension of the Ultra Low Emissions Zone to the North and South Circulars, imposing stinging costs on owners of older diesels who can’t afford newer ones; nor Rishi Sunak’s £7 billion pledge for sustainable transport in cities outside London — only £1.5