TOPSHOT - Extinction Rebellion climate change activists perform a mass "die in" under the blue whale in the foyer of the Natural History Museum in London on April 22, 2019, on the eighth day of the environmental group's protest calling for political change to combat climate change. - Climate change protesters who have brought parts of London to a standstill said Sunday they were prepared to call a halt if the British government will discuss their demands. Some 963 arrests have been made and 42 people charged in connection with the ongoing Extinction Rebellion protests. (Photo by Tolga Akmen / AFP)

TOPSHOT - Extinction Rebellion climate change activists lie on the floor as they perform a mass "die in" in the main hall of the Natural History Museum in London on April 22, 2019, on the eighth day of the environmental group's protest calling for political change to combat climate change. - Climate change protesters who have brought parts of London to a standstill said Sunday they were prepared to call a halt if the British government will discuss their demands. Some 963 arrests have been made and 42 people charged in connection with the ongoing Extinction Rebellion protests. (Photo by Tolga Akmen / AFP)

TOPSHOT - Extinction Rebellion climate change activists in red costume attend a mass "die in" in the main hall of the Natural History Museum in London on April 22, 2019, on the eighth day of the environmental group's protest calling for political change to combat climate change. - Climate change protesters who have brought parts of London to a standstill said Sunday they were prepared to call a halt if the British government will discuss their demands. Some 963 arrests have been made and 42 people charged in connection with the ongoing Extinction Rebellion protests. (Photo by Tolga Akmen / AFP)

TOPSHOT - A climate change protester takes away plants in a wheelbarrow as police break up their camp on Waterloo Bridge in London on April 21, 2019, on the seventh day of an environmental protest by the Extinction Rebellion group. - Climate change activists continued their demonstration into a seventh day in London with protest camps at iconic locations despite over 700 arrests. (Photo by Niklas HALLE'N / AFP)

TOPSHOT - Climate change activists play music as the group continue to block the road on Waterloo Bridge in London on April 21, 2019, on the seventh day of an environmental protest by the Extinction Rebellion group. - Climate change activists continued their demonstration into a seventh day in London with protest camps at iconic locations despite over 700 arrests. (Photo by Niklas HALLE'N / AFP)

TOPSHOT - Climate change activists parade around Parliament Square in London on April 21, 2019, on the seventh day of an environmental protest by the Extinction Rebellion group. - Climate change activists continued their demonstration into a seventh day in London with protest camps at iconic locations despite over 700 arrests. (Photo by Niklas HALLE'N / AFP)