Almost 300 people have been arrested so far this week after campaigners blocked some of the capital's most iconic locations, many camping in tents on the streets.
Below them a bearded demonstrator wearing a hi-vis vest glued his hand to the train window before being removed by officers and arrested.
Since Monday, the "Extinction Rebellion" has blocked areas at Marble Arch, Waterloo Bridge, Parliament Square and Oxford Circus. Within minutes of the action, Transport for London's website reported "delays between Bank and Lewisham due to a customer incident at Canary Wharf".
Travel disruption has been reported at a busy commuter station in London as a third consecutive day of protesting over climate change has got underway.
Extinction Rebellion said such direct action was important to bring about change.
"Units are in the process of responding, including specialist teams trained in protest removal", a spokesperson for British Transport Police (BTP) said.
An XR statement said: "Our aim is to create moments in time when humanity stops and fully considers the extent of the harm we have done and are doing to life on earth".
"It is absolutely crucial to get more people using public transport, as well as walking and cycling, if we are to tackle this climate emergency", Khan said.
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Transport for London (TfL) said: "We will restore access as soon as we are able to do so".
Police said they expected the demonstrations to continue in the next few weeks and promised to take action if necessary.
The mayor of London, Sadiq Khan, said that while he shared the passion of the protesters about the urgent need to tackle climate change, he was "extremely concerned" about plans to disrupt the underground.
The police have ordered the protesters to confine themselves to a zone within Marble Arch, a space at the junction of Hyde Park, the Oxford Street main shopping thoroughfare and the Park Lane street of plush hotels.
"Targeting public transport in this way would only damage the cause of all of us who want to tackle climate change", he said in a statement.
Twenty-nine arrests were made in Edinburgh on Tuesday night after police cleared remaining activists who were sitting down across the city's North Bridge.
The group, which is founded by British activists, has three aims: the first is to get governments to declare a "climate emergency", reduce net greenhouse gas emissions to zero by 2025, and for citizens' assemblies to lead the government on climate and ecological justice.