Declaring “the start of a new era” in energy production, President Donald Trump signed an executive order Tuesday that he said would revive the coal industry and create jobs.

The move makes good on his campaign pledge to unravel former President Barack Obama’s plan to curb global warming. The order seeks to suspend, rescind or flag for review more than a half-dozen measures in an effort to boost domestic energy production in the form of fossil fuels.

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“California is already a climate leader. We still are,” said Michael Wara, an associate professor of law at Stanford University. “What’s happened is that a lot of rest of the country, which was starting to catch up, just stepped back to circa 2005. But not much is going to change in California because are state laws are already pushing the envelope.”