A climate change activist shouts as he is being detained by police during an Extinction Rebellion protest in London, Britain April 15, 2019.

Police officers detain a climate change activist at Waterloo Bridge during the Extinction Rebellion protest in London, Britain April 16, 2019. REUTERS/Peter Nicholls - RC1E89EE00D0

Climate change activists attend the demonstration at Oxford Circus during the Extinction Rebellion protest in London, Britain April 17, 2019.

Police officers detain a climate change activist at Oxford Circus during the Extinction Rebellion protest in London, Britain April 18, 2019.

Police officers detain a climate change activist at Waterloo Bridge during the Extinction Rebellion protest in London, Britain April 18, 2019.

Police officers detain climate change activists at Oxford Circus during the Extinction Rebellion protest in London, Britain April 18, 2019.

Police officers detain a climate change activist at Waterloo Bridge during the Extinction Rebellion protest in London, Britain April 18, 2019.

Police officers detain a climate change activist at Waterloo Bridge during the Extinction Rebellion protest in London, Britain April 16, 2019.

Police officers detain a climate change activist at Waterloo Bridge during the Extinction Rebellion protest in London, Britain April 16, 2019.

Climate change activists attend the demonstration at Oxford Circus during the Extinction Rebellion protest in London, Britain April 17, 2019.

Climate change activists glue themselves to the boat parked at Oxford Circus during the Extinction Rebellion protest in London, Britain April 18, 2019. REUTERS/Simon Dawson - RC1BFAB3DDE0

Police officers detain a climate change activist at Waterloo Bridge during the Extinction Rebellion protest in London, Britain April 16, 2019.

Police officers detain a climate change activist at Waterloo Bridge during the Extinction Rebellion protest in London, Britain April 17, 2019.

Climate change activists from Extinction Rebellion protest sit after glueing themselves to the front fence of Britain's opposition Labour Party leader Jeremy Corbyn's house in London, Britain April 17, 2019.

A police officer approaches a climate change activist at Waterloo Bridge during the Extinction Rebellion protest in London, Britain April 16, 2019. REUTERS/Peter Nicholls - RC1D62BE3A50

Police detain a protester as climate change activists demonstrate during an Extinction Rebellion protest at the Waterloo Bridge in London, Britain April 15, 2019.

Police officers detain a climate change activist at Oxford Circus during the Extinction Rebellion protest in London, Britain April 17, 2019.

Police officers detain a climate change activist at Oxford Circus during the Extinction Rebellion protest in London, Britain April 18, 2019.

Police detain a protester as climate change activists demonstrate during an Extinction Rebellion protest at the Waterloo Bridge in London, Britain April 15, 2019.

Police officers detain a climate change activist at Waterloo Bridge during the Extinction Rebellion protest in London, Britain April 16, 2019.

Police officers detain a climate change activist at Oxford Circus during the Extinction Rebellion protest in London, Britain April 18, 2019.

Police officers talk with climate change activists at Oxford Circus during the Extinction Rebellion protest in London, Britain April 18, 2019.

Police officers detain a climate change activist at Oxford Circus during the Extinction Rebellion