Teenage climate change activist Greta Thunberg told the Extinction Rebellion protesters in London that they are “making a difference”.

The 16 year-old Swedish schoolgirl was welcomed with cheers as took to the stage in Marble Arch on the seventh day of the demonstration.

“For way too long the politicians and people in power have got away with not doing anything at all to fight the climate crisis and ecological crisis,” she said.

“But we will make sure that they will not get away with it any longer.”

It came as police cleared the last protesters from Waterloo Bridge and the total of arrests reached 963.

Extinction Rebellion: Climate change protests cause chaos in London Show all 46 1 /46 Extinction Rebellion: Climate change protests cause chaos in London Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf A protester gives a thumbs up as he stalls a DLR train at Canary Wharf station in London Reuters Extinction Rebellion: Climate change protests cause chaos in London City of London Protesters hold up traffic on Upper Thames Street in the City of London Getty Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf Protesters hold a banner as they hold up a DLR train at Canary Wharf station in London Reuters Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Officers remove plants that were placed in the occupation of Waterloo Bridge PA Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Police officers arrive at Oxford Circus as they prepare to remove protesters during the fifth day of a coordinated protest by the Extinction Rebellion group, April 19 Getty Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge An activist waters the plants at the occupation on Waterloo Bridge PA Extinction Rebellion: Climate change protests cause chaos in London Heathrow airport Undeterred by over 400 arrests, climate change activists continued their demonstration into a fifth day in London with a small protest at the country's main Heathrow Airport, along with the ongoing protest camps at other iconic locations around the British capital Reuters Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Protesters with the words 'glued on' written on their hands hold hands as police officers arrive at Oxford Circus Getty Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Officers circle the lorry that serves as the central stage to the Waterloo Bridge occupation, repeating their tactic from a earlier at the Oxford Circus occupation Reuters Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Oxford Circus reopens after being closed for days due to occupation AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Officers prepare to move in on the occupation of Waterloo Bridge PA Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Activists relax on a sofa at the occupation on Waterloo Bridge AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus British actress Emma Thompson talks to members of the media from atop the pink boat after police officers surrounded the boat being used as a stage as climate change activists occupy the road junction at Oxford Circus in central London during the fifth day of environmental protesst by the Extinction Rebellion group AFP Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge An Extinction Rebellion demonstrator is carried away by police on Waterloo Bridge PA Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Activists on Waterloo Bridge have made a garden for their occupation site, April 20 Reuters Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Demonstrators began blocking off a bridge and major central road junctions on April 15 at the start of a civil disobedience campaign calling for governments to declare an ecological emergency over climate change, to reduce greenhouse gas emissions to zero by 2025, halt biodiversity loss and be led by new "citizens' assemblies on climate and ecological justice" Reuters Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Emma Thompson joins the Extinction Rebellion protest at Oxford Circus. Thompson spoke from the pink boat at the centre of the occupation AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Heathrow airport Extinction Rebellion protesters sit outside Heathrow Airport on April 19 Reuters Extinction Rebellion: Climate change protests cause chaos in London Heathrow airport Climate protestors hold a demo outside Heathrow Airport Getty Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Police officers detain a climate change activist at Waterloo Bridge Reuters Extinction Rebellion: Climate change protests cause chaos in London Marble Arch Protesters prepare for another day at Marble Arch as the Extinction Rebellion protests enter their fifth day Getty Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus British actress Emma Thompson gives an address from the stage atop the pink boat AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Actress Emma Thompson takes a photo with a Extinction Rebellion demonstrator PA Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Climate change activists blockade Oxford Circus on the third day of an environmental protest by the Extinction Rebellion group AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Climate change activists stand atop a bus shelter as they take part in a blockade of Waterloo Bridge AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf Police is seen as climate change activists demonstrate during the Extinction Rebellion protest, at Canary Wharf DLR station in London Reuters Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Police speak to climate change activists blockading Waterloo bridge AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge epa07511673 A demonstrator gestures the hand heart as protesters from the Extinction Rebellion campaign group block Waterloo Bridge in central London, Britain, 17 April 2019. The Extinction Rebellion are holding a number of protests across London to draw attention to climate change. EPA/NEIL HALL NEIL HALL EPA Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Climate change activists, one (right) with her hand glued to the underside of a truck parked across Waterloo Bridge AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Environmental campaigners protest in the centre of Oxford Circus Getty Extinction Rebellion: Climate change protests cause chaos in London Jeremy Corbyn's Home 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 Reuters Extinction Rebellion: Climate change protests cause chaos in London Marble Arch Dozens of tents have been pitched at Marble Arch in a large scale occupation Reuters Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf station Police remove climate activists who glued themselves on top of a train at Canary Wharf station EPA Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Police forces carry a protester AP Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf station A climate change protestor who glued his hand to a window halts a DLR train AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Extinction Rebellion demonstrators on Waterloo Bridge, London, after police issued a Section 14 Public Order Act 1986 warning. PRESS ASSOCIATION Photo. Picture date: Wednesday April 17, 2019. See PA story ENVIRONMENT Climate. Photo credit should read: Jonathan Brady/PA Wire Jonathan Brady PA Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge epa07512336 Extinction Rebellion climate change demonstrators protest on Waterloo Bridge during climate change protests in London, Britain, 17 April 2019. The Extinction Rebellion are holding a number of protests across London to draw attention to climate change. EPA/ANDY RAIN ANDY RAIN EPA Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge epa07512368 Extinction Rebellion climate change demonstrators protest on Waterloo Bridge during climate change protests in London, Britain, 17 April 2019. Waterloo Bridge remains closed as protests continue. EPA/ANDY RAIN ANDY RAIN EPA Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Extinction Rebellion demonstrators in Oxford Circus, London, as more than 200 people have been arrested as police deal with ongoing climate change protests. PRESS ASSOCIATION Photo. Picture date: Wednesday April 17, 2019. See PA story ENVIRONMENT Climate. Photo credit should read: Kirsty O'Connor/PA Wire Kirsty O'Connor PA Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus LONDON, ENGLAND - APRIL 17: An Environmental campaigner is carried by police officers at Oxford Circus during the third day of a coordinated protest by the Extinction Rebellion group on April 17, 2019 in London, England. More than 100 arrests have been made, with demonstrations blocking a number of locations across the capital. (Photo by Leon Neal/Getty Images) Leon Neal Getty Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Pedestrians and a cyclist pass graffiti drawn by protestors who blocked Waterloo Bridge AP Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Climate change protestors practice yoga on Waterloo Bridge AFP/Getty Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge A climate change activist gestures while being detained by police officers Reuters Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Protestors sit on the road AP Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Extinction Rebellion demonstrators on Waterloo Bridge, London, as more than 200 people have been arrested as police deal with ongoing climate change protests. PRESS ASSOCIATION Photo. Picture date: Wednesday April 17, 2019. See PA story ENVIRONMENT Climate. Photo credit should read: Yui Mok/PA Wire Yui Mok PA Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Police forces carry a protestor to arrest him at Oxford Circus in London, Wednesday, April 17, 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 Photo/Frank Augstein) Frank Augstein AP

Greta has been nominated for a Nobel Peace Prize after she inspired the movement which saw pupils skip school all over the world to demand action against climate change.

Last week she urged MEPs at the European Parliament that they should “panic” about the environmental challenges facing the world, including species extinction, deforestation and ocean pollution.

The teenager is due to meet environment secretary Michael Gove, Labour leader Jeremy Corbyn and Green Party MP Caroline Lucas during her visit to the UK.

She arrived at Marble Arch on Sunday and tweeted a picture of herself standing among the tents of protesters.

Speaking at a rally at 7pm, she said: “Humanity is now standing at a crossroads. We must now decide which path we want to take.

“How do we want the future living conditions for all living species to be like?

“We have gathered here today, and in many other places throughout London and across the world too, we have gathered today because we have chosen which path we want to take and now we are waiting for the others to follow our example.”

Greta told the cheering crowds: “We are the ones making a difference – we the people in Extinction Rebellion and the children’s School Strike for the Climate – we are the ones making a difference.

“And we will never stop fighting, we will never stop fighting for this planet, for ourselves, our futures and for the futures of our children and grandchildren.”

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As she took to the stage, the Metropolitan Police announced that a total of 963 people had been arrested since the protests began a week ago.

A total of 40 people, aged between 19 and 77, have been charged with obstructing a highway and obstructing police.

The Extinction Rebellion protesters are now debating whether to pause their demonstration and change tactics, after the protests at Oxford Circus, Parliament Square and Waterloo Bridge were dismantled.