Road traffic in parts of central London have been brought to a halt Monday.
Climate change protesters have blocked Waterloo Bridge, sparking traffic disruption in central London.
Members of campaign group Extinction Rebellion have also parked a boat at Oxford Circus, and blocked Marble Arch as part of a global day of action.
Yen Chit Chong, from Extinction Rebellion in London, said: "This is our last best shot at survival."
Police have advised people travelling into London to allow extra journey time. No arrests have been made.
From local news reports on the BBC, the police are monitoring the protests and redirecting traffic around the obstructions. A large number of protestors brought plants to turn Waterloo Bridge into a community garden. It looks like a sound stage has been set up. Some protestors have set up tents and vowed to stay until they are arrested.
There is a rally in Parliament Square. Extinction Rebellion have warned that actions will escalate during the week.
At 11am on Monday, protesters set up camps and roadblocks at Marble Arch, Oxford Circus, Waterloo Bridge, Parliament Square and Piccadilly Circus. The roadblocks are planned to continue round the clock for at least a week in a protest reminiscent of the Occupy London camp outside St Paul’s Cathedral in 2011-12.
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The group is demanding immediate action over environmental destruction, after dire predictions that humans face an existential threat if climate change and the loss of biodiversity continues.
It is calling on the government to reduce carbon emissions to zero by 2025 and establish a citizens’ assembly to devise an emergency plan of action similar to that seen during the second world war.
Participants in the protests are being forewarned they might be arrested for taking part in non-violent civil disobedience. Organisers have circulated legal advice to anyone planning to attend. They have also requested they refrain from using drugs and alcohol and asked that they treat passersby and the environment with respect.
On a lighter note, a video of an excellent reason for Londoners to be stopped in their tracks has gone viral. Members of the cast of Cats were going to Brussels by Eurostar from St Pancras Station. They found 91 year old Dennis Robinson. He plays the piano for passing passengers and shoppers in the concourse, twice a week as part of the station’s “Street Piano” initiative of its arts programme.