The effort, known as the Net Zero Asset Managers (NZAM) initiative, was launched in late 2020 to encourage fund firms to reach net zero emission targets by 2050 and limit the rise in global temperatures.
As of Nov. 9, NZAM counted 291 signatories representing some $66 trillion in assets under management.
As recently as May Vanguard was touting commitments it had made in line with NZAM's goals.
Vanguard said the change "will not affect our commitment to helping our investors navigate the risks that climate change can pose to their long-term returns."
"Vanguard was never serious about implementing its net zero commitment" Cuvelier said in a statement.