Climate protesters are once again trying to shut down parts of London to urge residents to do more to protect the Earth from rising temperatures.

Oscar-winning actress Emma Thompson joined a rally by the Extinction Rebellion protesters in central London on Friday. She told the demonstrators in Oxford Circus "it makes me so happy to be able to join you all and to add my voice to the young people here who have inspired a whole new movement."

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Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Climate protesters are once again trying to shut down parts of London to urge residents to do more to protect the Earth from rising temperatures.

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

London police say more than 570 climate protesters have been arrested since the protests began four days ago.

Police attempt to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police attempt to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A protestor holds glue at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A protestor holds glue at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A police office tries to unchain a protestor with power tools at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A police office tries to unchain a protestor with power tools at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police try to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police try to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Protestors glue their hands together at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Protestors glue their hands together at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest a protestor couple who are glued together by their hands, at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest a protestor couple who are glued together by their hands, at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police attempt to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police attempt to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest a protestor couple glued by their hands at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest a protestor couple glued by their hands at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrests protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrests protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019.  The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrests protestors at Oxford Circus in London, Friday, April 19, 2019.  The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrests protestors at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

The protesters managed to keep Waterloo Bridge over the River Thames in London closed to vehicles, although a demonstration at London's Heathrow Airport drew only a small number of people and did not affect the busy facility.

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

London police say more than 570 climate protesters have been arrested since the protests began four days ago.

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police attempt to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police attempt to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A protestor holds glue at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A protestor holds glue at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A police office tries to unchain a protestor with power tools at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A police office tries to unchain a protestor with power tools at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police try to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police try to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Protestors glue their hands together at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Protestors glue their hands together at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest a protestor couple who are glued together by their hands, at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest a protestor couple who are glued together by their hands, at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police attempt to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police attempt to get the hands of a protestor out of a pipe at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest a protestor couple glued by their hands at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest a protestor couple glued by their hands at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrests protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrests protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019.  The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrest protestors at Oxford Circus in London, Friday, April 19, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrests protestors at Oxford Circus in London, Friday, April 19, 2019.  The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police arrests protestors at Oxford Circus in London, Friday, April 19, 2019. The environmental pressure group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)