The actress has been photographed on the Extinction Rebellion boat in the central London location, surrounded by police. Preaching to cheering supporters, she said politicians had “failed young people”. Since the protests started last week, more than 500 Extinction Rebellion demonstrators have been arrested by police.

Dame Emma, 60, said: “We are here in this little island of sanity and it makes me so happy to be able to join you all and to add my voice to the young people here who have inspired a whole new movement.”

A flight from Los Angeles International Airport to London Heathrow generates around 1.67 tonnes of CO2.

The actress’ flight comes after one of the organisers of Extinction Rebellion, Robin Boardman-Pattison, said earlier this week flying should only be used in emergencies.

Members of the climate change group demonstrated at Heathrow Airport today and threatened to disrupt flights over Easter.

The 20 protesters stood by the tunnel leading to Heathrow Terminals 2 and 3.

However they left only a few hours after they arrived with campaigner Robin Ellis-Cockcroft saying the group had succeeded in creating an “emotional disruption” at the airport.

With regards to Heathrow Airport, Dame Emma said: “We will occupy until you take action because that’s the only way we are going to save our planet.

“We have to be here, we have to do this. It’s inconvenient for people sometimes but its much more inconvenient to leave a planet that’s so completely destroyed.”

Mayor of London Sadiq Khan said he was “extremely concerned” about the possible disruption at Heathrow Airport.

He said: ”This is extremely dangerous, illegal and is putting an unacceptable toll on our police force and our city.”

The police have warned that the protests are putting a huge strain on officers across London. 

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