BlackRock Inc. is parting ways with one of the world’s biggest climate-investor groups after being targeted by Republican politicians for its efforts on global warming.

The money manager has decided to leave the Net Zero Asset Managers initiative it said in a letter to clients on Thursday. Membership in the group “caused confusion regarding BlackRock’s practices and subjected us to legal inquiries from various public officials,” the New York-based firm said.

BlackRock, which oversees more than $

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