Democratic presidential candidate Bernie Sanders calls climate change the greatest threat to national security. Front-runner Hillary Rodham Clinton promises to install more than 500 million solar panels across the country.

On the Republican side, Jeb Bush would phase out tax credits for solar power. Rival Marco Rubio wants to cut the federal gas tax by 80 percent.

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If the Senate's version of the One Big Beautiful Bill Act passes, the 30% federal tax credits offered for clean energy installations — such as these solar panels being installed atop an Ellenwood home in 2022 — would be sunset by the end of 2025. (Jason Getz/AJC 2022)

Credit: Jason Getz / Jason.Getz@ajc.com

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Senate Majority Leader John Thune, R-S.D. (center) is flanked by GOP whip Sen. John Barrasso, R-Wyo. (left) and Finance Committee Chairman Mike Crapo, R-Idaho, as Thune speak to reporters at the Capitol in Washington on Tuesday, July 1, 2025. Earlier Tuesday, the Senate passed the budget reconciliation package of President Donald Trump's signature bill of big tax breaks and spending cuts. (J. Scott Applewhite/AP)

Credit: AP