Environmental protesters have mobilized to take over five of London's most iconic locations, bringing streets to a standstill, with the aim of forcing the United Kingdom government to take serious action on the "global climate emergency".
The demonstration, which XR describes as non-violent civil disobedience, comes on the back of similar action in November that saw thousands of protesters occupy five bridges in central London.
Extinction Rebellion said protests would continue throughout the week "escalating the creative disruption across the capital day by day". "You can't just put a load of trees on Waterloo Bridge!"
A TfL spokesman said: "The safety of our customers and staff is our number one priority and we're working closely with the police to manage the impact on London's transport network". They have left us with no other option.
The demonstrations are part of a global campaign, organised by the British climate group Extinction Rebellion, which encompasses protests in 80 cities, across 33 countries, in the coming days.
Speaking at a meditation on the eve of the protests, Dr Williams said humans had declared war on nature.
"We are still in this position, and still facing this crisis", she said. "We wish to make peace with ourselves by making peace with our neighbour Earth and with our God".
Yen Chit Chong, from Extinction Rebellion in London, said: "This is our last best shot at survival".
Activists gathered at Hyde Park yesterday and were encouraged to camp there overnight before a march towards Piccadilly Circus today.
Savannah, a protester for Extinction Rebellion, defended the protests and said the group want to start important conversations.
Police have advised Londoners to leave extra time for their journeys because of possible delays caused by the protest.
Scotland Yard said they have "appropriate policing plans" in place for the demonstrations and that officers will be used from across the force "to support the public order operation during the coming weeks".