How One Senator Doomed the Democrats’ Climate Plan

First, he killed a plan that would have forced power plants to clean up their climate-warming pollution. Then, he shattered an effort to help consumers pay for electric vehicles. And, finally, he said he could not support government incentives for solar and wind companies or any of the other provisions that the rest of his party and his president say are vital to ensure a livable planet.

Senator Joe Manchin III of West Virginia, who took more campaign cash from the oil and gas industry than any other senator, and who became a...