"This is an insane move by this president," California Gov. Jerry Brown said, blasting the decision as "deviant behavior from the highest office in the land."
Brown joined Gov Jay Inslee of Washington state and Gov Andrew Cuomo of New York to form the US Climate Alliance to uphold the Paris climate agreement, a pact involving nearly 200 nations aimed at slowing the warming of the planet.
The three states already belong to an emissions reduction pact of states and cities worldwide, but yesterday's action marked a direct stand against the Trump administration and a formal commitment to upholding the targets of the Paris agreement.
"We governors are going to step into this cockpit and fly the plane," Inslee told reporters. "The president wants to ground it we're going to fly it."
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Trump formally announced his decision to leave the historic international agreement after months of teasing the action. He criticized the pact as a job-killer that put the United States as an unfair advantage.
It may be years, however, before the country can formally exit the deal, but Trump said he'll immediately halt implementation. He said he would consider re-entry if the US could get a better deal.
"President Trump's courageous decision to exit the Paris Accord recognizes that the United States is not legally bound to an Obama-era agreement that set unrealistic emissions targets at the expense of billions of American taxpayer dollars without the approval of Congress," said Texas Attorney General Ken Paxton, who joined nine other states in urging Trump to leave the agreement.
Under the Paris agreement, negotiated during former President Barack Obama's tenure, the United States voluntarily committed to reducing polluting emissions by 1.6 billion tons by 2025.
The Democratic governors' new pact commits to that same goal, which requires a 26 to 28 per cent reduction in emissions from 2005 levels.
California is already working to reduce greenhouse gas emissions by 40 per cent from 1990 levels by 2030, and Brown has cast himself as Trump's chief foil on climate policy. It's unclear when discussions between the three governors began, but they announced their new pact within an hour of Trump's announcement.
Brown is about to begin a trip to China to discuss emissions-reduction policies with other leaders and has promised to fill the void left by the Trump administration. At home, Brown is battling to reauthorize a cap-and-trade program that expires in 2020, a key piece of his political legacy. He's said California's economy is proof that combating climate change isn't the economic deadweight Trump suggests.
West Virginia Coal Association Senior Vice President Chris Hamilton said US withdrawal from the Paris accord would build confidence in US mining and industry even if it wouldn't make major changes on the ground. Trump promised during his campaign to bring back coal mining jobs.
"I think it slows down this rush toward punitive measures against the United States industrial base and mining industry," Hamilton said.