Some of the world’s largest financial institutions have stopped putting their money behind oil production in the Canadian province of Alberta, home to one of the world’s most extensive, and also dirtiest, oil reserves.

In December, the insurance giant The Hartford said it would stop insuring or investing in oil production in the province, just weeks after Sweden’s central bank said it would stop holding Alberta’s bonds. And on Wednesday BlackRock, the world’s largest asset manager, said that one of its fast-growing green-oriented funds would stop investing in companies that get revenue from the Alberta oil sands.

They are among the latest banks, pension funds and global investment houses to start pulling away from fossil-fuel investments amid growing pressure to show they are doing something to fight climate change.

“If you look at how destructive oil sands can be, there’s a very strong rationale,” Armando Senra, head of BlackRock’s iShares Americas funds, said in an interview, saying that the oil sands, along with coal, are “the worst offenders, if you want, from a climate perspective.”