The 89-year-old actress has called on the public to take part in the Restore Nature Now march in London on Saturday, with more than 50,000 predicted to attend, according to organisers.
Chris Packham led Extinction Rebellion protesters tonight as they stormed the Science Museum's new climate gallery over its sponsorship by a mining company.
Roger Hallam and other eco-activists launched the protest, under the name Heathrow Pause, in a bid to close the transport hub and force the Government to abandon its plans for third runway.