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 is urging Americans concerned about climate change and considering a third-party presidential candidate to vote for Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE instead.

In an interview with ThinkProgress, Gore said he understands the “feelings and misgivings” of voters turned off by both Clinton and GOP nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE.

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But he said voters who want to tackle climate change should vote for the former secretary of State, not Green Party candidate Jill Stein or anyone else.

“I particularly urge anyone who is concerned about the climate crisis, sees it as the kind of priority that I see it as, to look at the sharp contrast between the solar plan that Secretary Clinton has put forward, and her stated commitment to support the Clean Power Plan, and the contrast between what she has said and is proposing with the statements of the Republican nominee, which give me great concern,” Gore told ThinkProgress.

Clinton leads Trump in national polls, but her support dips when voters are asked about candidates like Stein and Libertarian nominee Gary Johnson Gary Earl JohnsonWhat the numbers say about Trump's chances at reelection Presidential race tightens in Minnesota as Trump plows resources into state The Hill's Campaign Report: Biden condemns violence, blames Trump for fomenting it l Bitter Mass. primaries reach the end l Super PAC spending set to explode MORE.

Gore, who saw his own presidential campaign hindered by the presence of a third-party candidate in 2000, said the “harsh reality is that we have two principal choices” for president.

“I respect those who analyze the situation differently, but in my experience it matters a lot,” he said.

Gore said he was voting for Clinton in a string of tweets before the Democratic National Convention last month, saying, “given her qualifications and experience — and given the significant challenges facing our nation and the world, including, especially, the global climate crisis, I encourage everyone else to do the same.”

He’s endorsed other candidates, including Patty Judge, the Democrat challenging Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyGOP set to release controversial Biden report McConnell locks down key GOP votes in Supreme Court fight Senate Republicans face tough decision on replacing Ginsburg MORE (R-Iowa), but he’s yet to hit the campaign trail for Clinton or others.