'We Will Never Stop Fighting': Teen Activist Tells London Climate Protesters

Swedish activist Greta Thunberg has addressed climate change protesters in London, making a strong stance against powerful figures standing idle in the face of climate change.

For nearly a week, activists have taken over London landmarks protesting the British government's policies on the environment.

'Extinction Rebellion', the group behind the protests, called for non-violent civil disobedience to force the British government to reduce net greenhouse gas emissions to zero by 2025 and stop what it calls a global climate crisis.

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Crowds gather to listen to Greta Thunberg speak in London. Image: AAP

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Thunberg, 16, who led the international school strikes for climate action, spoke to the thousands of protesters at Marble Arch.

Fresh from addressing the U.N. last week over environment issues, Thunberg was cheered on to the stage by chants of "We love you".

Thunberg answered the rally's cries, declaring they were fighting for their future.

"We will never stop fighting, we will never stop fighting for this planet and for ourselves, our futures and the futures of our children and grandchildren," she said.

Despite more than 750 arrests made during the protests, Thunberg told the rally their actions were "making a difference".

"I come from Sweden and back there it is almost the same problem as here, as everywhere, that nothing is being done to stop the climate and ecological crisis despite all the beautiful words and promises," she said.

"We are now facing an existential crisis, the climate crisis and the ecological crisis which have never been treated as crises before, they have been ignored for decades."

"For way too long the politicians and people in power have gotten away with not doing anything at all to fight the climate crisis and the ecological crisis but we will make sure they don't get away with it any longer."

Greta Thunberg speaking in London. Image: AAP

Thunberg further riled up the crowd, claiming humanity was "at a crossroads", and now they must wait for the rest of the world "follow our example".

"We must now decide which path we want to take," she said.

"How do we want future living conditions for all species to be like? We have gathered here today and on many places around 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."

A Extinction Rebellion protester is carried by police officers in London. Source: Getty.

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Police have spent the weekend removing protesters from landmarks, such as Parliament House and Waterloo Bridge, and are working on reopening parts of the city that have been blocked off by rallies.