Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) is "astounded" the U.S. will have a president who doesn't believe in climate change.

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"What astounds me, and I hope this changes very quickly, is we now have a president-elect who actually does not believe that climate change is real," Sanders said of president-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on CBS's "Face the Nation" Sunday.



"I worry very much about what this means."

Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE railed on Trump during the presidential campaign for once saying that climate change was created by the Chinese to make U.S. manufacturing noncompetitive, though he later said the remark was a joke.

And multiple reports have indicated that Trump is looking for ways to withdraw the U.S. from a global agreement to limit carbon emissions in an effort to slow climate change.

Sanders said Sunday that Trump needs to be confronted about the realities of the issue.

"I worry very much about what this means for our kids and our grandchildren and the future of this planet," Sanders said.

"Millions of people are going to have to tell him, 'Mr. Trump: You are dead wrong,' and we are going to have to transform our energy system."