LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Oxford Circus, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Oxford Circus, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Oxford Circus, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Oxford Circus, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )

LONDON, UNITED KINGDOM - APRIL 15: Protestors at the 'Extinction Rebellion' demonstration shut off the roads to traffic around Marble Arch, in London, United Kingdom on April 15, 2019. The protestors are disrupting multiple locations in central London to demand the government acts on the climate and ecological emergency. ( Kate Green - Anadolu Agency )