Exclusive: Target is 81% emissions cut compared with 1990, but activists say it must be backed by plan of action

Keir Starmer will announce a stringent new climate goal for the UK on Tuesday, the Guardian can reveal, with a target in line with the advice given to the government by its scientists and independent advisers.

The UK will pledge to cut emissions by 81% compared with 1990 levels by 2035, a target in line with the recommendations of the Climate Change Committee, according to three people familiar with the matter.