Police Officers stand guard as Extinction Rebellion demonstrators peacefully block an entrance at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)

LONDON (AP) — Protesters in New York City brought traffic to a standstill in the city's busiest hub and an activist in London climbed atop a plane as climate change demonstrators entered the fourth day of rallies around the world.

Protesters transported a green boat on a trailer into Times Square and then sat down and refused police orders to move.

The boat bore the logo of the activist group Extinction Rebellion. It also had the words "Act Now" written on it and a string of brightly colored flags.

Some of the demonstrators carried signs in the shape of orange rescue lifebuoys, with the words, "Save our Future."

The New York Police Department made dozens of civil disobedience arrests and removed the vessel some time later, which led to re-opened area streets and brought the traffic back to normal.

In London, a climate change activist scaled a British Airways plane at London City Airport. Extinction Rebellion identified the activist as a former Paralympic cyclist. A video streamed by the group showed the activist clinging to the fuselage.

British Airways says that customers were booked onto alternative flights to Amsterdam.

In a separate incident, BBC Newsnight political editor Nicholas Watt tweeted that his flight from London to Dublin had been grounded after a protester stood up to deliver a lecture on climate change just as it was to take off.

Activists sought to shut down London City Airport on Thursday as part of their wave of protests worldwide.

The environmental protests have been taking place in cities around the world.

The group got its start in London last year, and has since spread to other countries.

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Read more stories on climate change by The Associated Press at https://www.apnews.com/Climate

A demonstrator wearing an Extinction Rebellion tie is removed by Police Officers as demonstrators peacefully block an entrance at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
An Extinction Rebellion demonstrator gestures with a banner as he occupies a raised area at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
Police Officers stand guard as an Extinction Rebellion demonstrator ties a banner to a raised area at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
An Extinction Rebellion demonstrator gestures with a banner as he occupies a raised area at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
Extinction Rebellion demonstrators occupy a raised area at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
Police Officers stand guard as an Extinction Rebellion demonstrator gestures with a banner on a raised area at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
Travellers make their way past as an Extinction Rebellion demonstrator is removed at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
Police Officers stand guard as Extinction Rebellion demonstrators peacefully block an entrance to City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
An Extinction Rebellion flag flies as demonstrators occupy a raised area at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
Extinction Rebellion demonstrators sing as they occupy a raised area at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
Police officers remove an Extinction Rebellion demonstrator, left, after he occupied a raised area at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
A climate change protester is arrested and carried off by police in Trafalgar Square in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Alastair Grant)
Police officers wearing safety equipment remove an Extinction Rebellion demonstrator, left in red helmet, and a banner after he occupied a raised area at City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
Climate change protesters lie in to joined bathtubs as the demonstrate in Trafalgar Square in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming.(AP Photo/Alastair Grant)
Climate change protesters are extracted and arrested from a hearse in Trafalgar Square in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming.(AP Photo/Alastair Grant)
Climate change protesters are removed from a hearse and arrested in Trafalgar Square in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Alastair Grant)
Passengers arrive on foot from a traffic jam caused by Extinction Rebellion climate change protesters blocking a road outside City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
An Extinction Rebellion climate change protester holds placards during a demonstration outside City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
An Extinction Rebellion climate change protester is removed by police from blocking a road outside City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
Extinction Rebellion climate change protesters block a road outside City Airport in London, Thursday, Oct. 10, 2019. Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)
An Extinction Rebellion climate change protester is removed by police from blocking a road outside City Airport in London, Thursday, Oct. 10, 2019.  Some hundreds of climate change activists are in London during a fourth day of world protests by the Extinction Rebellion movement to demand more urgent actions to counter global warming. (AP Photo/Matt Dunham)