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Thousands of people gathered outside Vancouver City Hall on Friday to participate in one of dozens of climate strikes across the country.

Supporters began trickling in as early as 9:45 a.m. After a brief rally at city hall, marchers took to the streets at 1:30 p.m.

WATCH: Aerial view of climate strike march from Vancouver City Hall

0:51 Aerial view of climate strike march from Vancouver City Hall Aerial view of climate strike march from Vancouver City Hall

GALLERY: Vancouverites pack the streets for climate strike

Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Trish Jewison Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Trish Jewison Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Trish Jewison Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Aaron McArthur/Global News Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Global News Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Global News Story continues below advertisement Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Global News Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Global News Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Global News Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Global News Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Aaron McArthur/Global News Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Global News Story continues below advertisement Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Aaron McArthur/Global News Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Global News Climate strike protesters at Vancouver City Hall on Friday, Sept. 27, 2019. Aaron McArthur/Global News

Organizers had hoped to see 15,000 people turn up, but by 3 p.m. Vancouver police estimated that around 80,000 people had swarmed the streets. That estimate later grew to 100,000.

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Police said there were no major public safety issues, despite the crowd.

Fire officials in Victoria estimated 20,000 people turned out in the capital city.

Many in the crowd carried signs with messages such as “This is not what we meant by Hot Girl Summer,” “Act now or swim later,” and “I’m sure the dinosaurs thought they had time too.”

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Samantha Lin, a student at Prince of Wales Secondary and an organizer of Sustainabiliteens, said she has been thrilled to see the growth of the movement since students held their first strike in Vancouver last December.

“We’re about a month away from the election, we want to bring climate to the forefront of everybody’s minds when it comes to that,” Lin said.

READ MORE: Here’s how climate change will impact the region where you live

“This is one way we are doing that. I’m 17 years old, I can’t vote yet, a lot of people here are still in school, they can’t vote yet either. This is our way of making our voices heard.”

More than half a dozen cities in British Columbia, including Victoria and Kelowna, are playing host to climate change demonstrations on Friday.

Massive crowds gathered outside the B.C. legislature, including federal NDP leader Jagmeet Singh.

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There will be road closures this afternoon for the #Victoria Climate Change Protest in the downtown core. Updates will be posted on Twitter #yyjtraffic pic.twitter.com/CAG8IBHbOs — Victoria Police (@vicpdcanada) September 27, 2019

Conservative Leader Andrew Scheer, who was also in B.C., said he would not march, but that other Conservative politicians would participate in marches across the country.

Green Leader Elizabeth May and Liberal Leader Justin Trudeau both marched in Montreal.

B.C. Premier John Horgan opted out of the march, citing meetings, but said he was delighted to see young people making their voices heard.

WATCH: Sights and sounds of B.C. Legislature climate rally

0:48 British Columbians gather at Legislature to demand action on climate change British Columbians gather at Legislature to demand action on climate change

B.C. Environment Minister George Heyman issued a statement that touted the government’s CleanBC program but acknowledged that more work needs to be done.

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“Our plan ensures that we’re open and transparent about our goals and how we’re doing in our efforts to meet them,” he said. “We expect to be held accountable, and we’re putting new mechanisms in place so British Columbians can do just that.”

Protesters point to dire warnings by the International Panel on Climate Change (IPCC), which predicts that emissions must be cut by 45 per cent from 2010 levels by 2030, and reach net zero by 2050 to avoid severe climate change impacts.

The IPCC released a report earlier this month warning sea levels could rise by more than a metre by the end of the century if emissions aren’t reduced, while a 2019 report by Canadian government scientists predicted increased wildfire activity, sea ice loss, and drought.

2/2 He says individual change is great but doesn’t absolve companies and govts of responsibility to make systemic change. And that doesn’t include reps tokenizing movement to get elected and not following through @CKNW @GlobalBC #ClimateStrikeCanada #ClimateStrikeVancouver — Srushti Gangdev (@SrushtiGangdev) September 27, 2019

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Friday’s global strike is one of two scheduled to coincide with the United Nations Climate Action Summit and is timed for teen climate activist Greta Thunberg’s arrival in Montreal.

“I expect that you as well as other countries take your responsibility and do your part from a global perspective,” the 16-year-old Swede told protesters in Montreal on Friday.

“We are having so much impact that people want to silence us, we’ve become too loud for people to handle.”

#VanTraffic Please avoid the area of Cambie Street, north of West Broadway and Cambie Street bridge. Expect traffic disruption in the area. #climatestrike — Vancouver Police (@VancouverPD) September 27, 2019

Vancouver residents were being warned of possible snarled traffic in the downtown core.

The planned route intersects Beatty, Cambie, Hamilton, Homer, Richards, Seymour, Smithe, Robson and West Georgia streets.

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Vancouver police will also be monitoring the event and police will be working to reduce the impact on traffic and the public.

WATCH: Federal Election 2019: Singh campaign joins climate strike in Victoria