During the protest police stopped and impounded a 20 ft red and white model boat on a road in Kennington, London.
The model lightship, named Greta, had been pushed from Brighton to London by Extinction Rebellion activists to join the organisation's "national rebellion" in the capital.
Claudia Fisher, 58, from West Sussex, was arrested after gluing herself to the model lightship as the police attempted to seize it, a moment which was captured live on BBC news.
Prior to the seizure, she had explained to journalists why the campaigners had built the lightship:
"We're highlighting the climate and ecological emergency that we're already in middle of.
"We're shining a light with a lightship, it's a beacon of hope on that dark situation."
Greta Thunberg at Extinction Rebellion protest in London
Jack W Capon, 30, a student from Horsham was also arrested during the seizure of Lightship Greta for refusal to provide information for the police to administer a Fixed Penalty Notice.
Several other local campaigners have been arrested so far during the protest which began in London earlier this month.
Laurence Johnson, 33, a Camera Assistant from central Brighton; Mala Nathan, 47, an environmental consultant and holistic therapist from east Brighton; and Ben Benatt, 53, a chartered environmental engineer from Patcham were all arrested during the first days of the demonstration for sitting in the road in Parliament Square and have been released pending investigation.
Simon Brooks, 43, of Burgess Hill, a father of two was arrested on September 3rd on Lambeth Bridge for obstructing the highway.
The Extinction Rebellion campaigners built the model boat to help sound the alarm about the climate crisis.
The boat is the combination of a ship and a lighthouse, and is named after Greta Thunberg, the seventeen year-old Swedish activist whose outspoken criticism of governmental climate inaction has inspired people the world over.
Forty Extinction Rebellion campaigners took part in the walk from the south coast to the capital, accompanied by a samba band.
The group pushed Greta themselves and stopped each day in a different town to speak to local people about the climate and ecological emergency, as well as to raise awareness about climate refugees.