“This doesn’t change our commitments,” said Kevin Rabinovitch, global sustainability director at Mars, which has pledged to eliminate 100 percent of its greenhouse gas emissions from its factories and offices by 2040. “We’re doing this because we see a real business risk. We see a real business problem.”

Businesses large and small have scrambled in the days since Mr. Trump’s victory to chart their next moves in an uncertain regulatory situation. Mr. Trump’s campaign pledges and musings have been driven by the belief that the economy will grow faster if businesses are freed from cumbersome federal regulations, especially those that limit carbon emissions.

The president-elect has heightened environmentalists’ fears that his administration will take on an anti-climate, anti-environment bent by appointing the climate contrarian Myron Ebell to lead the E.P.A. transition. Climate change activists have denounced Mr. Ebell, whose Competitive Enterprise Institute has received funding from oil and gas interest groups.

Some corporations, like the country’s largest automakers, have already seized on a potential upside to the president-elect’s leanings, urging a rethinking of stringent federal auto emissions standards. An easing of federal standards for passenger cars, which together with the rest of the transportation sector emit more carbon dioxide than any other part of the American economy, could have immense implications for overall emissions.