Mr. Castro’s plan, also released Tuesday, includes several ideas either directly adopted from or developed in consultation with Mr. Inslee, such as a plan to replace all coal-fired power generation with zero-emissions sources by 2030, and a proposal to marshal $10 trillion in federal, state, local and private spending on jobs associated with the transition from polluting to nonpolluting energy.
Democratic strategists said that Mr. Inslee’s influence on the rest of the party’s presidential field was clear.
“Inslee is one of those rare candidates who did not last for more than a few months but had a big impact on the race,” said Robert Shrum, a veteran Democratic consultant and director of the Jesse M. Unruh Institute of Politics at the University of Southern California. “His candidacy is over, but his ideas do live on.”
Senator Bernie Sanders of Vermont, a rival of Ms. Warren’s on the left, has not explicitly taken up Mr. Inslee’s ideas. Instead, analysts said, he is trying to win over the progressive wing of the Democratic Party with a climate plan that takes its name from the Green New Deal and has the biggest price tag of all the candidates’ proposals — $16.3 trillion. He has called for banning fracking to extract natural gas and halting the import and export of coal, oil and natural gas.
“I think Sanders is looking for ways to prove that he’s the true progressive in the race,” said Paul Bledsoe, a lecturer at American University’s Center for Environmental Policy.
Polls reflect that climate change is a rising concern among voters.
In a poll published by Quinnipiac University last week, a majority of registered voters nationwide, 56 percent, said that climate change is an emergency. That majority included 84 percent of Democrats, but 81 percent of Republicans said that climate change is not an emergency. Among 18- to 34-year-old voters, who may expect to be the most affected by climate change, 74 percent said that climate change is an emergency.
Voters also think that the United States is not doing enough to address climate change, with 67 percent of voters saying more needs to be done — a new high since the question was first asked by the Quinnipiac poll in December 2015.
Thomas Kaplan contributed reporting from Boston.
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