Police officers carry away an activist as Extinction Rebellion protesters block a road with caravan in central London, Britain, October 15, 2019. REUTERS/Toby Melville 

Co-founder of the Extinction Rebellion group, Gail Bradbrook, places a sign atop the doorway into the Department of Transport, during an Extinction Rebellion protest in London, October 15, 2019. REUTERS/Henry Nicholls 

Co-founder of the Extinction Rebellion group, Gail Bradbrook, uses a hammer and a screwdriver as she tries to break a window atop the doorway into the Department of Transport, during an Extinction Rebellion protest in London, October 15, 2019. REUTERS/Henry Nicholls 

A police officer stands next to a climate activist attached to a caravan as Extinction Rebellion protesters block a road in central London, October 15, 2019. REUTERS/Toby Melville 

Co-founder of the Extinction Rebellion group, Gail Bradbrook, reacts as she is removed from atop the doorway into the Department of Transport, during an Extinction Rebellion protest in London, October 15, 2019. REUTERS/Henry Nicholls 

Co-founder of the Extinction Rebellion group, Gail Bradbrook, sits atop the doorway into the Department of Transport, during an Extinction Rebellion protest in London, October 15, 2019. REUTERS/Henry Nicholls 

Police officers detain co-founder of the Extinction Rebellion group, Gail Bradbrook, after she was removed from atop the doorway into the Department of Transport, during an Extinction Rebellion protest in London, October 15, 2019. REUTERS/Henry Nicholls 

A protester reads a mock-up newspaper as they block the road during an Extinction Rebellion demonstration at Bank, in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

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, October 15, 2019. REUTERS/Henry Nicholls 

Children wave an Extinction Rebellion flag during a demonstration, in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

A protester eats fake money outside the BlackRock office during an Extinction Rebellion demonstration in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

"Red Brigade" activists walk during an Extinction Rebellion demonstration, in London, October 14, 2019. REUTERS/Henry Nicholls 

A protester lies on the ground after she glued herself to revolving door of Barclays Bank during an Extinction Rebellion demonstration in Canary Wharf, London, October 14, 2019. REUTERS/Dylan Martinez 

A protester eats fake money outside the BlackRock office during an Extinction Rebellion demonstration in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

Protester hold placards during an Extinction Rebellion demonstration, in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

Police officers detain an activist as they block the road during an Extinction Rebellion demonstration at Bank, in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

Police officer are seen as protesters block the road during an Extinction Rebellion demonstration at Bank, in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

A protester talks with a police officer as they block the road during an Extinction Rebellion demonstration at Bank, in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

A protester holds a placard as they block the road during an Extinction Rebellion demonstration at Bank, in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

Protesters block the road during an Extinction Rebellion demonstration at Bank, in the City of London, October 14, 2019. REUTERS/Henry Nicholls 

Climate change activists attend an Extinction Rebellion demonstration in London, October 12, 2019. REUTERS/Henry Nicholls 

Climate change activists attend an Extinction Rebellion demonstration in London, October 12, 2019. REUTERS/Henry Nicholls 

"Red Brigade" activists attend an Extinction Rebellion demonstration in London, October 12, 2019. REUTERS/Henry Nicholls