Former Vice President Al Gore Albert (Al) Arnold GoreCruz says Senate Republicans likely have votes to confirm Trump Supreme Court nominee 4 inconclusive Electoral College results that challenged our democracy Fox's Napolitano: 2000 election will look like 'child's play' compared to 2020 legal battles MORE (D) endorsed former Vice President Joe Biden Joe BidenJoe Biden looks to expand election battleground into Trump country Trump puts Supreme Court fight at center of Ohio rally Special counsel investigating DeVos for potential Hatch Act violation: report MORE's (D) presidential candidacy on Wednesday during a climate change-focused livestream discussion on Earth Day.

"We need policy changes, and that means we need to change some of the policymakers, particularly the one in the White House," Gore said.

He added that he would tell an undecided voter, "This is the most consequential choice in a presidential election that we've ever had in American history. Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE is the face of climate denial globally. He is lifting the constraints on polluters."

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Biden is the presumptive Democratic nominee following Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE's (I-Vt.) recent exit from the nomination contest.

Gore said later that people should vote for Biden to "put us on the road to solving the climate crisis and creating a brighter future."

Gore's endorsement comes on the same day that Washington Gov. Jay Inslee Jay Robert InsleeBarr asked prosecutors to explore charging Seattle mayor over protest zone: report Bottom line Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D), whose 2020 presidential campaign was largely centered on environmental issues, also threw his support behind Biden.

Some Sanders-aligned environmental advocates have called for Biden to take on bolder climate plans. The presidential candidate has expressed willingness to do so, saying in a statement this week that "in the months ahead, expanding this plan will be one of my key objectives. ”

Gore, who served as Bill Clinton William (Bill) Jefferson ClintonGOP brushes back charges of hypocrisy in Supreme Court fight Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE's vice president, ran for president himself in 2000. He narrowly lost to former President George W. Bush.

Since then, Gore has won the Nobel Peace Prize for his efforts to draw attention to climate change.

--Updated at 3:43 p.m.