SEC Chairman Gary Gensler testifies before the U.S. Senate Committee on Banking, Housing and Urban Affairs during an oversight hearing on Capitol Hill in Washington, D.C., September 15, 2022.

Securities and Exchange Commission Chair Gary Gensler on Wednesday will hold a vote on one of his most controversial proposals: a rule that would require corporate America to disclose material risks posed by climate change.

President Joe Biden said climate risk is an "existential threat" and that it posed a greater risk than nuclear war.