Sens. Sheldon Whitehouse (D-R.I.) and Ed Markey (D-Mass.), two of the Senate’s most aggressive advocates for action on climate change, said Friday that President-elect Trump’s second term will be a major setback for that action but expressed confidence there would still be opportunities for progress.

There is uncertainty about what will happen to the world's battle against climate change as President-elect Trump says he'll again withdraw the U.S. from the Paris Climate Agreement. Fred Krupp, president of the Environmental Defense Fund,

US president-elect Donald Trump's expected climate rollbacks will likely have a "small" impact on global warming, as long as other countries resist the temptation to slacken their own carbon-cutting efforts,