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Green Party co-leader Jonathan Bartley and climate activist George Monbiot have been arrested after joining Extinction Rebellion protesters on Whitehall.

The party confirmed Mr Bartley's arrest on Twitter, writing: “Our co-leader Jonathan Bartley has been arrested on Whitehall whilst peacefully protesting.”

Mr Monbiot was pictured refusing to move from the road at Whitehall, where he was then arrested.

The 56-year-old had been warned by police if he continued to obstruct the highway he would be detained for a breach of public order.

He was surrounded by Extinction Rebellion supporters before his arrest, including 20 “red brigade” protesters.

During his arrest, Mr Monbiot said: “I’m here because this is the right thing to do.

“We have to stand up, we have to make a stand against the destruction of our life support systems.

“Business as usual and politics as usual is just going to destroy our beautiful planet.”

This morning he wrote in The Guardian that he hoped to be arrested today.

"A few hours after this column is published, I hope to be in a police cell", he wrote.

He called seeking arrest a "controversial tactic" but one that "often proved effective".

Extinction Rebellion London Protests: October 2019 - In pictures 144 show all Extinction Rebellion London Protests: October 2019 - In pictures 1/144 An Extinction Rebellion protester who has scaled the scaffolding surrounding Big Ben at the Houses of Parliament, Westminster, London PA 2/144 An Extinction Rebellion protester who has scaled the scaffolding surrounding Big Ben PA 3/144 An Extinction Rebellion protester who has scaled the scaffolding surrounding Big Ben PA 4/144 A climate activist dressed as Britain's Prime Minister Boris Johnson gestures after climbing scaffolding AFP via Getty Images 5/144 An Extinction Rebellion climate change activist is seen on the scaffolding of the Big Ben tower REUTERS 6/144 An Extinction Rebellion climate change activist is seen on the scaffolding of the Big Ben tower REUTERS 7/144 An Extinction Rebellion climate change activist is seen on the scaffolding of the Big Ben tower REUTERS 8/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 9/144 Police attempt to remove a protester that is sat on top of a bamboo structure built to block the road at Oxford Circus PA 10/144 Police escort protesters on Whitehall in London during an Extinction Rebellion (XR) climate change protest PA 11/144 Protesters read mock-up newspapers in Oxford Circus, London, during an Extinction Rebellion (XR) climate change protest PA 12/144 Steve Coogan during an Extinction Rebellion (XR) climate change protest in Whitehall, London PA 13/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 14/144 A protesters is removed by police at Oxford Circus, London, during an Extinction Rebellion (XR) climate change protest. PA 15/144 A protesters is removed by police at Oxford Circus, London, during an Extinction Rebellion (XR) climate change protest PA 16/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 17/144 British designer Vivienne Westwood, gestures with West Papua activist Benny Wenda (2nd left) and her son activist and businessman Joe Corre (right) during a protest action to highlight the exploitation of the West Papua rainforest and the continued presence of BP, outside the headquarters of BP in London AFP via Getty Images 18/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 19/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 20/144 Extinction Rebellion protests at Oxford Circus Nick Roberts-Moore 21/144 Extinction Rebellion protests at Oxford Circus Nick Roberts-Moore 22/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 23/144 Extinction Rebellion at Canning Town ITV News 24/144 Extinction Rebellion at Canning Town ITV News 25/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 26/144 Extinction Rebellion at Canning Town PA 27/144 Extinction Rebellion at Canning Town PA 28/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 29/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 30/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 31/144 Extinction Rebellion protests continue in Whitehall Nigel Howard 32/144 Extinction Rebellion protests continue in Whitehall Nigel Howard 33/144 XR activists in Trafalgar Square Jon Slack 34/144 Demonstrators, including mothers and babies, take part in a protest organised by Extinction Rebellion, outside of the doors of the Google offices in London Reuters 35/144 Extinction Rebellion on Embankment Jeremy Selwyn 36/144 Co-founder of the Extinction Rebellion group, Gail Bradbrook, speaks as she kneels atop the doorway into the Department of Transport, during an Extinction Rebellion protest in London Reuters 37/144 Jeremy Selwyn 38/144 A police officer tries to remove a woman after she attached herself with an adhesive to the building of Department of Transport, during an Extinction Rebellion protest in London Reuters 39/144 Trafalgar Square is cleared Jeremy Selwyn 40/144 Police officers lead away a protester as they clear Trafalgar Square Nigel Howard 41/144 Police order climate protesters to leave Trafalgar Square on Monday night Nigel Howard 42/144 Activists protest outside of the Bank of England (L) during the eighth day of demonstrations by the climate change action group Extinction Rebellion, in London AFP via Getty Images 43/144 A protester lies on the ground after she glued herself to revolving door of Baclays Bank during an Extinction Rebellion demonstration in Canary Wharf, LondoN Reuters 44/144 Activists hold placards as they protest outside the the Bank of England (L) and Royal Exchange, during the eighth day of demonstrations by the climate change action group Extinction Rebellion, in London AFP via Getty Images 45/144 Reuters 46/144 Rabbi Jeffrey Newman kneels on the street during Extinction Rebellion protest, before his arrest, in London via Reuters 47/144 Protesters 'eat money' as a form of demonstration outside the BlackRock headquarters in Throgmorton Avenue in London, during an Extinction Rebellion (XR) climate change protest PA 48/144 Protesters sit outside the BlackRock office during an Extinction Rebellion demonstration in the City of London Reuters 49/144 A protester is carried away by police as others block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protest PA 50/144 Protesters chant slogans at they block the road during an Extinction Rebellion demonstration at Bank, in the City of London Reuters 51/144 Protesters blocking the road outside Mansion House in the City of London, during an Extinction Rebellion (XR) climate change protest PA 52/144 Protesters block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protest PA 53/144 Protesters block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protest PA 54/144 Protesters block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protest PA 55/144 Protesters block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protes PA 56/144 Police watch protestors at a 'Disabled Rebels' demonstration organised by Extinction Rebellion outside New Scotland Yard in London Reuters 57/144 "The Red Brigade" activists attend an Extinction Rebellion demonstration in London Reuters 58/144 Police at the scene as Animal Rebellion activists protest at Billingsgate Fish Market in Poplar, London PA 59/144 Extinction Rebellion protesters outside BBC HQ Broadcasting House Daniel Leal-Olivas/AFP 60/144 Police officers monitor the protesters blocking the entrance to the BBC in London, during an Extinction Rebellion (XR) protest PA 61/144 Extinction Rebellion at London City Airport Jeremy Selwyn 62/144 Extinction Rebellion protest, Whitehall Nigel Howard 63/144 Police carry away a climate activist at a protest action at the BBC offices AFP via Getty Images 64/144 Police officers stand next to protesters as they block the entrance of the BBC Headquarters during an Extinction Rebellion demonstration in London Reuters 65/144 Protesters block the entrance of the BBC Headquarters during an Extinction Rebellion demonstration in London Reuters 66/144 Protesters hold a placard outside the BBC Headquarters during an Extinction Rebellion demonstration in London Reuters 67/144 Extinction Rebellion at London City Airport Jeremy Selwyn 68/144 Activists stage a 'Hong Kong style' blockage of the exit from the Docklands Light Railway to City Airport, London PA 69/144 Extinction Rebellion at London City Airport Jeremy Selwyn 70/144 A protester, who Extinction Rebellion says is former Paralympic athlete James Brown, lies on top of a British Airways plane at London City Airpor Reuters 71/144 Extinction Rebellion protesters dressed as airport marshalls block the road during a demonstration, near London City Airpor Reuters 72/144 Police officers arrest an activist at London City Airport during the fourth day of demonstrations by the climate change action group Extinction Rebellion, AFP via Getty Images 73/144 Extinction Rebellion at Trafalgar Square Jeremy Selwyn 74/144 Police detain a man Nigel Howard 75/144 Extinction Rebellion protest, Whitehall Nigel Howard 76/144 A Police line guards Parliament Square Nigel Howard 77/144 Police confiscate 'Hay' at Parliament Square Nigel Howard 78/144 Police meet protester dressed as Kangaroos at Parliament Square Nigel Howard 79/144 Extinction Rebellion protests continue here outside the Supreme Court. Nigel Howard 80/144 Police start to remove two protestors locked together at Bird Cage Walk Nigel Howard 81/144 Police surround protesters on top of a wooden structure on Birdcage Walk during the third day of an Extinction Rebellion (XR) protest in Westminste PA 82/144 Stanley Johnson, father of Prime Minister, Boris Johnson, joins protesters in Trafalgar Square PA 83/144 Police attempt to separate a pair of protesters who have glued themselves to each other adjacent to the Women of World War Two memorial on Whitehall, during the third day of an Extinction Rebellion (XR) protest in Westminster, London PA 84/144 Police arrest a protester who had been glued to others in a circle PA 85/144 Britain's Chancellor of the Duchy of Lancaster Michael Gove holds an Extinction Rebellion leaflet as he walks into the back of Downing Street during a demonstration in London Reuters 86/144 Police on Birdcage Walk as they attempt to remove a wooden structure during the third day of an Extinction Rebellion (XR) protest in Westminster, London PA 87/144 Tents at the Extinction Rebellion camp on Marsham Street, Westminster, London PA 88/144 Jeremy Selwyn 89/144 PA 90/144 Extinction Rebellion protesters hold a 'feed-in' protest Jeremy Selwyn 91/144 Activists waving flags emblazoned with the Extinction Rebellion logo descend on Whitehall on Tuesday night Nigel Howard 92/144 AP 93/144 PA 94/144 Jeremy Selwyn 95/144 AP 96/144 Jeremy Selwyn 97/144 Lord Andrew Fraser confronts protesters Jeremy Selwyn 98/144 Extinction Rebellion at Smithfield Jeremy Selwyn 99/144 Extinction Rebellion at Smithfield Jeremy Selwyn 100/144 Extinction Rebellion via Reuters 101/144 Benedict Cumberbatch joins XR protesters in Trafalgar Square 102/144 Protesters block off road opposite the Home Office Nigel Howard 103/144 Protesters gather at Lambeth Bridge Nigel Howard 104/144 A dancer entertains crowds in Marsham Street Nigel Howard 105/144 Protesters in Horseferry Road opposite the Home Office Nigel Howard 106/144 Police hold a protester during an Extinction Rebellion (XR) demonstration in Westminster PA 107/144 A man wearing a gas mask stand on top of a car as other demonstrators block Trafalgar Square AP 108/144 The group will occupy the road outside if they are unable to take the arrivals and departures lounge. Jeremy Selwyn 109/144 Jeremy Selwyn 110/144 A man dressed as Santa Claus holds a banner during the Extinction Rebellion protest at Westminster Bridge in Londo Reuters 111/144 Protesters with placards on Parliament Street, during an Extinction Rebellion (XR) protest in Westminster PA 112/144 People distribute free food at Westminster Bridge during the Extinction Rebellion protest in London Reuters 113/144 Artists perform at Westminster Bridge during the Extinction Rebellion protest in London Reuters 114/144 Protesters climb the monuments at the Extinction Rebellion (XR) protest in Trafalgar Square PA 115/144 A climate change activist from the group Extinction Rebellion wearing a gas mask stands on top of a car demonstrating in Trafalgar Square AFP via Getty Images 116/144 Protesters set up tents in a camp during an Extinction Rebellion (XR) protest in Westminster, London PA 117/144 Protesters camped out at the back of Downing Street during an Extinction Rebellion (XR) protest in Westminster PA 118/144 A protester sits beneath a 'Love' banner during an Extinction Rebellion (XR) protest in Westminster PA 119/144 Protesters block the road during an Extinction Rebellion protest in outside the gates of Downing Street PA 120/144 Protesters with placards on Westminster Bridge, during an Extinction Rebellion (XR) protest in Westminster PA 121/144 The driver of hearse, who has attached himself to the steering wheel using a bicycle lock, as his vehicle is used to block the road at the junction of Whitehall and Trafalgar Square PA 122/144 Police officers detain an activist at Lambeth Bridge during the Extinction rebellion protest in London Reuters 123/144 Jeremy Selwyn 124/144 Jeremy Selwyn 125/144 Jeremy Selwyn 126/144 Jeremy Selwyn 127/144 Activists block Lambeth Bridge during the Extinction Rebellion protest in London Reuters 128/144 Protesters who are chained to a vehicle block Victoria Street during an Extinction Rebellion protest in Westminste PA 129/144 Police speak to a protester during an Extinction Rebellion (XR) demonstration in Westminster, London PA 130/144 Jeremy Selwyn 131/144 A police officer searches an Extinction Rebellion (XR) protester in Westminster UK 132/144 Jeremy Selwyn 133/144 Protesters and police on Whitehall during an Extinction Rebellion (XR) protest in Westminster, London UK 134/144 An activist holds a flag with the extinction symbol at Lambeth Bridge during the Extinction Rebellion protest in London Reuters 135/144 Police remove demonstrators who chained themselves to a trailer with a mock Trident missile John Dunne 136/144 Jeremy Selwyn 137/144 Jeremy Selwyn 138/144 Jeremy Selwyn 139/144 Jeremy Selwyn 140/144 Jeremy Selwyn 141/144 Jeremy Selwyn 142/144 Jeremy Selwyn 143/144 Police remove an Extinction Rebellion protester from Trafalgar Square in central London PA 144/144 Jeremy Selwyn 1/144 An Extinction Rebellion protester who has scaled the scaffolding surrounding Big Ben at the Houses of Parliament, Westminster, London PA 2/144 An Extinction Rebellion protester who has scaled the scaffolding surrounding Big Ben PA 3/144 An Extinction Rebellion protester who has scaled the scaffolding surrounding Big Ben PA 4/144 A climate activist dressed as Britain's Prime Minister Boris Johnson gestures after climbing scaffolding AFP via Getty Images 5/144 An Extinction Rebellion climate change activist is seen on the scaffolding of the Big Ben tower REUTERS 6/144 An Extinction Rebellion climate change activist is seen on the scaffolding of the Big Ben tower REUTERS 7/144 An Extinction Rebellion climate change activist is seen on the scaffolding of the Big Ben tower REUTERS 8/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 9/144 Police attempt to remove a protester that is sat on top of a bamboo structure built to block the road at Oxford Circus PA 10/144 Police escort protesters on Whitehall in London during an Extinction Rebellion (XR) climate change protest PA 11/144 Protesters read mock-up newspapers in Oxford Circus, London, during an Extinction Rebellion (XR) climate change protest PA 12/144 Steve Coogan during an Extinction Rebellion (XR) climate change protest in Whitehall, London PA 13/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 14/144 A protesters is removed by police at Oxford Circus, London, during an Extinction Rebellion (XR) climate change protest. PA 15/144 A protesters is removed by police at Oxford Circus, London, during an Extinction Rebellion (XR) climate change protest PA 16/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 17/144 British designer Vivienne Westwood, gestures with West Papua activist Benny Wenda (2nd left) and her son activist and businessman Joe Corre (right) during a protest action to highlight the exploitation of the West Papua rainforest and the continued presence of BP, outside the headquarters of BP in London AFP via Getty Images 18/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 19/144 Extinction Rebellion protests at Oxford Circus Jeremy Selwyn 20/144 Extinction Rebellion protests at Oxford Circus Nick Roberts-Moore 21/144 Extinction Rebellion protests at Oxford Circus Nick Roberts-Moore 22/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 23/144 Extinction Rebellion at Canning Town ITV News 24/144 Extinction Rebellion at Canning Town ITV News 25/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 26/144 Extinction Rebellion at Canning Town PA 27/144 Extinction Rebellion at Canning Town PA 28/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 29/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 30/144 Extinction Rebellion protests at Shadwell Jeremy Selwyn 31/144 Extinction Rebellion protests continue in Whitehall Nigel Howard 32/144 Extinction Rebellion protests continue in Whitehall Nigel Howard 33/144 XR activists in Trafalgar Square Jon Slack 34/144 Demonstrators, including mothers and babies, take part in a protest organised by Extinction Rebellion, outside of the doors of the Google offices in London Reuters 35/144 Extinction Rebellion on Embankment Jeremy Selwyn 36/144 Co-founder of the Extinction Rebellion group, Gail Bradbrook, speaks as she kneels atop the doorway into the Department of Transport, during an Extinction Rebellion protest in London Reuters 37/144 Jeremy Selwyn 38/144 A police officer tries to remove a woman after she attached herself with an adhesive to the building of Department of Transport, during an Extinction Rebellion protest in London Reuters 39/144 Trafalgar Square is cleared Jeremy Selwyn 40/144 Police officers lead away a protester as they clear Trafalgar Square Nigel Howard 41/144 Police order climate protesters to leave Trafalgar Square on Monday night Nigel Howard 42/144 Activists protest outside of the Bank of England (L) during the eighth day of demonstrations by the climate change action group Extinction Rebellion, in London AFP via Getty Images 43/144 A protester lies on the ground after she glued herself to revolving door of Baclays Bank during an Extinction Rebellion demonstration in Canary Wharf, LondoN Reuters 44/144 Activists hold placards as they protest outside the the Bank of England (L) and Royal Exchange, during the eighth day of demonstrations by the climate change action group Extinction Rebellion, in London AFP via Getty Images 45/144 Reuters 46/144 Rabbi Jeffrey Newman kneels on the street during Extinction Rebellion protest, before his arrest, in London via Reuters 47/144 Protesters 'eat money' as a form of demonstration outside the BlackRock headquarters in Throgmorton Avenue in London, during an Extinction Rebellion (XR) climate change protest PA 48/144 Protesters sit outside the BlackRock office during an Extinction Rebellion demonstration in the City of London Reuters 49/144 A protester is carried away by police as others block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protest PA 50/144 Protesters chant slogans at they block the road during an Extinction Rebellion demonstration at Bank, in the City of London Reuters 51/144 Protesters blocking the road outside Mansion House in the City of London, during an Extinction Rebellion (XR) climate change protest PA 52/144 Protesters block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protest PA 53/144 Protesters block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protest PA 54/144 Protesters block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protest PA 55/144 Protesters block the road in front of the Bank of England in the City of London, during an Extinction Rebellion (XR) climate change protes PA 56/144 Police watch protestors at a 'Disabled Rebels' demonstration organised by Extinction Rebellion outside New Scotland Yard in London Reuters 57/144 "The Red Brigade" activists attend an Extinction Rebellion demonstration in London Reuters 58/144 Police at the scene as Animal Rebellion activists protest at Billingsgate Fish Market in Poplar, London PA 59/144 Extinction Rebellion protesters outside BBC HQ Broadcasting House Daniel Leal-Olivas/AFP 60/144 Police officers monitor the protesters blocking the entrance to the BBC in London, during an Extinction Rebellion (XR) protest PA 61/144 Extinction Rebellion at London City Airport Jeremy Selwyn 62/144 Extinction Rebellion protest, Whitehall Nigel Howard 63/144 Police carry away a climate activist at a protest action at the BBC offices AFP via Getty Images 64/144 Police officers stand next to protesters as they block the entrance of the BBC Headquarters during an Extinction Rebellion demonstration in London Reuters 65/144 Protesters block the entrance of the BBC Headquarters during an Extinction Rebellion demonstration in London Reuters 66/144 Protesters hold a placard outside the BBC Headquarters during an Extinction Rebellion demonstration in London Reuters 67/144 Extinction Rebellion at London City Airport Jeremy Selwyn 68/144 Activists stage a 'Hong Kong style' blockage of the exit from the Docklands Light Railway to City Airport, London PA 69/144 Extinction Rebellion at London City Airport Jeremy Selwyn 70/144 A protester, who Extinction Rebellion says is former Paralympic athlete James Brown, lies on top of a British Airways plane at London City Airpor Reuters 71/144 Extinction Rebellion protesters dressed as airport marshalls block the road during a demonstration, near London City Airpor Reuters 72/144 Police officers arrest an activist at London City Airport during the fourth day of demonstrations by the climate change action group Extinction Rebellion, AFP via Getty Images 73/144 Extinction Rebellion at Trafalgar Square Jeremy Selwyn 74/144 Police detain a man Nigel Howard 75/144 Extinction Rebellion protest, Whitehall Nigel Howard 76/144 A Police line guards Parliament Square Nigel Howard 77/144 Police confiscate 'Hay' at Parliament Square Nigel Howard 78/144 Police meet protester dressed as Kangaroos at Parliament Square Nigel Howard 79/144 Extinction Rebellion protests continue here outside the Supreme Court. Nigel Howard 80/144 Police start to remove two protestors locked together at Bird Cage Walk Nigel Howard 81/144 Police surround protesters on top of a wooden structure on Birdcage Walk during the third day of an Extinction Rebellion (XR) protest in Westminste PA 82/144 Stanley Johnson, father of Prime Minister, Boris Johnson, joins protesters in Trafalgar Square PA 83/144 Police attempt to separate a pair of protesters who have glued themselves to each other adjacent to the Women of World War Two memorial on Whitehall, during the third day of an Extinction Rebellion (XR) protest in Westminster, London PA 84/144 Police arrest a protester who had been glued to others in a circle PA 85/144 Britain's Chancellor of the Duchy of Lancaster Michael Gove holds an Extinction Rebellion leaflet as he walks into the back of Downing Street during a demonstration in London Reuters 86/144 Police on Birdcage Walk as they attempt to remove a wooden structure during the third day of an Extinction Rebellion (XR) protest in Westminster, London PA 87/144 Tents at the Extinction Rebellion camp on Marsham Street, Westminster, London PA 88/144 Jeremy Selwyn 89/144 PA 90/144 Extinction Rebellion protesters hold a 'feed-in' protest Jeremy Selwyn 91/144 Activists waving flags emblazoned with the Extinction Rebellion logo descend on Whitehall on Tuesday night Nigel Howard 92/144 AP 93/144 PA 94/144 Jeremy Selwyn 95/144 AP 96/144 Jeremy Selwyn 97/144 Lord Andrew Fraser confronts protesters Jeremy Selwyn 98/144 Extinction Rebellion at Smithfield Jeremy Selwyn 99/144 Extinction Rebellion at Smithfield Jeremy Selwyn 100/144 Extinction Rebellion via Reuters 101/144 Benedict Cumberbatch joins XR protesters in Trafalgar Square 102/144 Protesters block off road opposite the Home Office Nigel Howard 103/144 Protesters gather at Lambeth Bridge Nigel Howard 104/144 A dancer entertains crowds in Marsham Street Nigel Howard 105/144 Protesters in Horseferry Road opposite the Home Office Nigel Howard 106/144 Police hold a protester during an Extinction Rebellion (XR) demonstration in Westminster PA 107/144 A man wearing a gas mask stand on top of a car as other demonstrators block Trafalgar Square AP 108/144 The group will occupy the road outside if they are unable to take the arrivals and departures lounge. Jeremy Selwyn 109/144 Jeremy Selwyn 110/144 A man dressed as Santa Claus holds a banner during the Extinction Rebellion protest at Westminster Bridge in Londo Reuters 111/144 Protesters with placards on Parliament Street, during an Extinction Rebellion (XR) protest in Westminster PA 112/144 People distribute free food at Westminster Bridge during the Extinction Rebellion protest in London Reuters 113/144 Artists perform at Westminster Bridge during the Extinction Rebellion protest in London Reuters 114/144 Protesters climb the monuments at the Extinction Rebellion (XR) protest in Trafalgar Square PA 115/144 A climate change activist from the group Extinction Rebellion wearing a gas mask stands on top of a car demonstrating in Trafalgar Square AFP via Getty Images 116/144 Protesters set up tents in a camp during an Extinction Rebellion (XR) protest in Westminster, London PA 117/144 Protesters camped out at the back of Downing Street during an Extinction Rebellion (XR) protest in Westminster PA 118/144 A protester sits beneath a 'Love' banner during an Extinction Rebellion (XR) protest in Westminster PA 119/144 Protesters block the road during an Extinction Rebellion protest in outside the gates of Downing Street PA 120/144 Protesters with placards on Westminster Bridge, during an Extinction Rebellion (XR) protest in Westminster PA 121/144 The driver of hearse, who has attached himself to the steering wheel using a bicycle lock, as his vehicle is used to block the road at the junction of Whitehall and Trafalgar Square PA 122/144 Police officers detain an activist at Lambeth Bridge during the Extinction rebellion protest in London Reuters 123/144 Jeremy Selwyn 124/144 Jeremy Selwyn 125/144 Jeremy Selwyn 126/144 Jeremy Selwyn 127/144 Activists block Lambeth Bridge during the Extinction Rebellion protest in London Reuters 128/144 Protesters who are chained to a vehicle block Victoria Street during an Extinction Rebellion protest in Westminste PA 129/144 Police speak to a protester during an Extinction Rebellion (XR) demonstration in Westminster, London PA 130/144 Jeremy Selwyn 131/144 A police officer searches an Extinction Rebellion (XR) protester in Westminster UK 132/144 Jeremy Selwyn 133/144 Protesters and police on Whitehall during an Extinction Rebellion (XR) protest in Westminster, London UK 134/144 An activist holds a flag with the extinction symbol at Lambeth Bridge during the Extinction Rebellion protest in London Reuters 135/144 Police remove demonstrators who chained themselves to a trailer with a mock Trident missile John Dunne 136/144 Jeremy Selwyn 137/144 Jeremy Selwyn 138/144 Jeremy Selwyn 139/144 Jeremy Selwyn 140/144 Jeremy Selwyn 141/144 Jeremy Selwyn 142/144 Jeremy Selwyn 143/144 Police remove an Extinction Rebellion protester from Trafalgar Square in central London PA 144/144 Jeremy Selwyn

Mr Monbiot added: "Mass arrests are a potent form of democratic protest.

"They work because they show that the campaigners are serious.

"When people are prepared to jeopardise their liberty for their cause, other people appear more likely to listen to what they say, and more likely to recognise its importance."

After Mr Bartley was arrested, a spokesman for The Green Party said: “Climate chaos will end ecosystems and collapse our society.

“We have just 10 years to reduce our C02 emissions to safer levels and climate protesters are drawing attention to that.

“We all have a right to peaceful protest and we will continue to act to protect that right and draw attention to instances where democracy is threatened.”