Police chiefs said last week they would mobilise thousands of officers to handle the protests in London and anyone who broke the law, even as part of non-violent civil disobedience, would be arrested.
The activist also defended the organisation's use of lock-on devices as nonviolent and said they didn't approve of the amount of police resources used at the protests.
When asked if she was 22 years old, whether she would have been on the streets of Wellington on Monday, Ardern replied: "I probably would have joined the (school) climate strike." referring to nationwide school student-led rallies that drew 170,000 in September.
"We're here because the government is not doing enough on the climate emergency", protester Lizzy Mansfield said.
London police said some 135 climate activists had been arrested.
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Government must act now to halt biodiversity loss and enact legally-binding policies to reduce greenhouse gas emissions to net zero by 2025.
London's Metropolitan Police announced they had arrested 276 through the course of Monday, the first day of protests in the city which the organisers of the Extinction Rebellion protest group vowed would entail two weeks of disruption. Early in the day, police said less than a hundred protesters, many of them waving flags and signs, had gathered near the toll plaza on the Dartmouth side.
The protesters, who are a part of the group Extinction Rebellion, said they made a decision to occupy the bridge as part of a broader movement.
A second group of protesters gradually formed on the square behind the museum, saying that those who remained on the street were determined to stay until they were arrested.
By lunchtime, another 300 people blocked Berlin's central Potsdamer Platz, placing couches, tables, chairs and flowerpots on the road.
Extinction Rebellion activists are protesting in cities around the world, including Berlin, Amsterdam and Sydney.
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Describing the scene close to Westminster Abbey, one onlooker said: "Half of them are smoking weed, have cheap fold up tents that will just get binned and there is a bunch sitting in Pret".
Melbourne activist Miriam Robinson told Australian Associated Press that protesters felt they had to "get right up in people's grills" by disrupting city traffic to convince the government to take firmer action on climate change.
Protesters will also attempt to stop traffic Monday afternoon over the Johnson street bridge in Victoria.
"Extinction Rebellion was a United Kingdom founded organization".
After arguing with protesters, Streatch then said he was going to be getting in his "diesel 400 horse power 350" and drive across the MacKay Bridge to get onto the peninsula.
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Leaders in the cannabis industry recently banded together to propose a regulatory framework for cannabis and sent a letter to U.S. On the national level, the situation has spurred the Trump administration to call for a ban on flavored e-cigarettes.
Founded in Britain a year ago, Extinction Rebellion, also known as XR, now has chapters in about 50 countries.