Climate change activists are seen during an Extinction Rebellion protest at Oxford Circus in London, Britain April 19, 2019.
The pace of reduction in emissions called for by Extinction Rebellion is far faster than that urged by the United Nations' Intergovernmental Panel on Climate Change, which previous year recommended they be cut to zero on a global basis by 2050.
Dozens of climate change protestors linked to a group which has brought London to a standstill staged a "non-violent" and colourful protest in Belfast city centre yesterday.
As of Saturday morning police officers had arrested 718 people and charged 28 in connection with the demonstrations which are expected to last two weeks.
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Dame Emma Thompson has rallied cheering Extinction Rebellion (XR) activists blocking London's busiest shopping street and declared "our planet is in serious trouble".
More than 500 protesters had been arrested by Thursday night as activists continued to ignore orders to leave roadblocks at Waterloo Bridge, Oxford Circus and Parliament Square.
The police have not said if or how they will clear the hundreds of demonstrators from other locations.
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Greta Thunberg, the teenage activist who inspired the worldwide school strikes against global warming, joined the Extinction Rebellion climate change protest in London on Sunday.
Extinction Rebellion protesters were warned by police they would face a "firm action" if it caused any offences - such as an obstruction of highway - at the site.
About 9,000 police officers have been responding to the protest since it began a week ago on 15 April.
Since Monday, Extinction Rebellion (XR) protestors have been stationed in Parliament Square, Marble Arch, Oxford Circus and Waterloo Bridge.
She added: "I think it's wrong that this is happening, this existential crisis, and that people have to do these things".
As part of their protest they have planted trees, glued themselves to stationary trains to prevent the trains from moving and disrupted travel near Heathrow airport.
The group wants the government to declare a climate emergency, reduce carbon emissions to zero by 2025 and establish a citizens' assembly to devise an emergency plan of action.