Labour weighs up delisting UK firms if they fail to fight climate change

John McDonnell's tough message likely to trip City alarm bells as party puts climate battle at heart of agenda

UK companies failing to tackle climate change would be delisted from the London Stock Exchange under radical plans for greening the economy being drawn up by Labour.

John McDonnell, the shadow chancellor, said he would consider changing the law if necessary to force UK-listed firms to take adequate steps to fight the "climate emergency" facing the planet.