Members of Extinction Rebellion, protesting issues related to climate change, gather at the Angus L. Macdonald Bridge in Dartmouth, N.S. on Monday, Oct. 7, 2019. THE CANADIAN PRESS/Andrew Vaughan

TORONTO -- Climate change activists Extinction Rebellion have organized a series of protests to block busy bridges to traffic across Canada.

The environmental campaigners, known as XR, seek to draw attention to the “climate emergency” and want to achieve net zero carbon emissions by 2025.

It plans to shut down some of Canada's busiest bridges on Monday, in line with protests around the world; including the Angus L. Macdonald Bridge over Halifax Harbour, the Burrard Street bridge in Vancouver and the Prince Edward Viaduct in Toronto, by having protesters lie down or sit in traffic lanes, according to The Canadian Press.

Halifax’s Macdonald Bridge was closed to vehicle, pedestrian and bike traffic for much of Monday morning as fewer than 100 XR members gathered for a protest, CTV News Atlantic reports.

The demonstration forced many commuters to take alternate routes to work and fueled congestion on main arteries throughout Halifax and Dartmouth.

CTV News Atlantic reported 18 protesters had been arrested by around 11.30 a.m. ET.

Police initally said they arrested 14 protesters under the Protection of Property Act for failing to leave the premises after being ordered to do so. They later corrected that number to 18 arrests.

The bridge was closed to traffic just before the protesters arrived on scene and police blocked their access to the bridge.

About 40,000 vehicles use the Macdonald bridge daily along with about 1,200 people who bike or walk across the span.

In Toronto, dozens of protestors shut the Prince Edward Viaduct connecting a main road in the east of the city to downtown Toronto. The demonstration, which was due to finish at 10 a.m. ET, still had protesters in place by 11.30 a.m.

Kevin Imrie, XR organizer in Toronto, said “maybe a dozen of people were arrested” after a number of protesters refused to disperse.

“We did the best that we could to close things down in an organized fashion,” Imrie told CTV News Channel.

“I understand that people are angry. I would also hope that they would be angry at the folks who are putting them in danger by not taking action on climate change.”

On the other side of the country police in Victoria, B.C., say they are prepared for another XR protest at the Johnson Street Bridge, CTV Vancouver Island reports.

Organizers said the action will close the Johnson Street Bridge to traffic from 3:30 p.m. to 7 p.m.

"The #BridgeOut campaign points out that the bridge to the future is being demolished by big oil, and oily politicians," said a Facebook page organizing the event.

"This escalation of tactics is the minimum of what’s necessary to give young people a fighting chance at a decent future. We regret that ordinary people will be frustrated by the commute disruption, but the collapse of human society would be a much bigger inconvenience."

Protesters also planned to shut down the Burrard Street Bridge in Vancouver, according to CTV News Vancouver. A Facebook group for the event indicated more than 2,000 people were interested in taking part in the closure.

And in Edmonton, a handful of XR protesters linked arms to block the Walterdale Bridge Monday morning to demand action on climate change.

Alberta Premier Jason Kenney, criticizing the action on Twitter, noted that traffic backups meant hundreds of cars were idling for no good reason.

The police service told The Canadian Press that an officer negotiated with the protesters, who agreed to end the blockade an hour earlier than planned.

No one was arrested, but police said they are investigating and there could still be charges.

The protest in Alberta’s capital was one of 60 happening around the world on Monday under the umbrella #BridgeOut, according to CTV News Edmonton.

Calgary was planning a "family-friendly" event on Monday afternoon with similar protests planned for Montreal, The Canadian Press reported.

Meanwhile in London, England, police arrested 21 climate change activists on Saturday and Sunday on suspicion of conspiracy to cause a public nuisance. Further protests took place in London on Monday.

The arrests come as protesters in Berlin and Amsterdam blocked roads ahead of what is being described as widespread demonstrations.

Last week, XR attempted to spray fake blood on a British government building in London, using an out-of-commission fire engine to drench the front of the Treasury building.

---- With files from The Canadian Press and The Associated Press

Some pixs of Extinction Rebellion protest, which has the Macdonald Bridge closed between Dartmouth and Halifax. No word on when it will be reopened.@CTVAtlantic @C100FM pic.twitter.com/1WeYvgxDbs

— Carl Pomeroy (@CarlPomeroyCTV) October 7, 2019

At the Macdonald Bridge pic.twitter.com/ZttwteQc5G

— Amy Stoodley (@AmystoodleyCTV) October 7, 2019