Donald Trump’s plan to bring an abrupt halt to America’s crusade against climate change will test California and other states like never before as they seek to wrest control of the nation’s energy future from a hostile White House.

The energy plan Trump unveiled on Tuesday left no doubt that the states are now on their own — and that the White House is already poised to weaken some of their pioneering efforts.

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“These states did not feel compelled to do anything while the EPA was acting” to combat climate change, said Michael Wara, an energy expert at Stanford Law School. “Now they are going to step up…. The last time we saw this fight, it was mostly California acting. That’s not the world we live in anymore. The more the EPA steps away, the more states are going to act.”