Constitutional challenge could have caused a huge headache
At issue was whether the Federal Government had the power to force provinces to implement a carbon tax. In a 6-3 decision, the Canadian Supreme Court agreed with Trudeau's Liberals that they did.
"This matter is critical to our response to an existential threat to human life ... As a result, it passes the threshold test and warrants consideration as a possible matter of national concern," the judgement said.
Canadian politics will be interesting this year. Trudeau has a minority government and will roll out a new budget next month. After that or after the vaccine rollout, he's likely to call an election and try to get a majority.
He's riding fairly high in the polls and a vaccine will help.
The playbook will be for him to say as little as possible during the campaign and then hike taxes after he has a majority, particularly on the wealthy and focusing on capital gains as well. This decision could also give him the power to increase the carbon tax.
Here's the text of the decision.