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Get ready for another environmental protest in Vancouver.

In the wake of today's approval of the Trans Mountain pipeline expansion by the National Energy Board, critics of the fossil-fuel industry plan to make their voices heard.

Climate Convergence Metro Vancouver is hosting a demonstration—"United for People and Planet! No Trudeau Pipeline Expansion!—from 4:30 p.m. to 6:30 p.m.

It begins outside a government building at 800 Burrard Street, followed by a march to the CBC building at 700 Hamilton Street.

On Facebook, it says 992 people are planning on attending and another 3,000 are interested.

"The world's climate scientists are clear: we have 12 years to drastically reduce carbon emissions or face catastrophic consequences," the page states. "They are also clear: the Trans Mountain Expansion pipeline (TMEP) is incompatible with any credible effort to get there.

"We can do this but the clock is ticking. Instead of making urgent and meaningful investments in sustainable development and renewable energy projects, the Trudeau government is committing billions in public funds toward expanding dirty Tar Sands bitumen extraction."

Last year, the Liberal government bought the Trans Mountain pipeline system from Texas-based Kinder Morgan for $4.5 billion.

Prime Minister Justin Trudeau and Finance Minister Bill Morneau are proceeding with a $9.3-billion expansion plan, which will nearly triple shipments of diluted bitumen from Alberta to the Lower Mainland.

If completed, this will increase oil tanker traffic in Burrard Inlet by nearly seven times—likely more than 400 of these vessels per year would be travelling underneath the Lions Gate Bridge on their way to export markets.