At Oxford Circus, a large pink boat was parked in the middle of the junction and Extinction Rebellion activists also glued themselves to that.
Extinction Rebellion said: "We've tried petitions, marches, letters, reports, papers, meetings, even direct actions; and global emissions have continued to rise".
Extinction Rebellion (XR), an environmentalist group responsible for causing scenes in the House of Commons earlier this month when semi-naked activists stripped off in Parliament as MPs tried to debate Brexit, claim they intend to occupy the roads for at least 72 hours.
Sudanese military forced to abandon attempt to clear protesters
The military high command has offered the protest leaders the opportunity to name a prime minister, Al Jazeera reported on Sunday. Since his ouster, al-Bashir - president for almost 30 years - has been under house arrest in Khartoum.
"They can change a few of the laws along with the Paris agreement so that we can really work towards achieving a practical target".
Hundreds of protesters had also blocked Waterloo Bridge, which was closed in both directions, with campaign group Extinction Rebellion declaring on their Twitter page: "We have taken Waterloo Bridge!"
He said: "We are here tonight to declare that we do not wish to be at war".
"They will be blocking five of the city's busiest and most iconic locations in a non-violent, peaceful act of rebellion where they invite people to join them for several days of creative, artist-led resistance".
Aircraft with the largest wingspan in the world completes first flight
By 2020 Stratolaunch aims to loft 250-ton rocket ships into the stratosphere to launch satellites. While it does have the largest wingspan, it does not have the longest nose-to-tail length.
Activists gathered at Hyde Park yesterday and were encouraged to camp there overnight before a march towards Piccadilly Circus today. Monday will see protesters in around 80 cities in more than 33 countries hold similar demonstrations on the same environmental issues, campaigners say.
The Metropolitan Police have said they have "appropriate" plans in place and that officers will be used "to support the public order operation during the coming weeks".
Police have advised people travelling into London to allow extra journey time.
Watch 2019 Boston Marathon Men’s Race End With Amazing Photo Finish
But it's still a competition, and a little late-race drama among elite athletes certainly doesn't hurt the viewing experience. Hasay was also the first American to finish in the Women's Elite race, Boston Marathon officials said .