If California wants to hit its goal for reducing greenhouse gas emissions, it has a lot of work to do. That’s the inescapable conclusion from a new report released by the Air Resources Board on Friday, which detailed a range of proposals for new regulations.

Legislation signed by Gov. Jerry Brown last year requires the state to slash emissions to 40% below 1990 levels by 2030, which is equivalent to 260 million metric tons.

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Michael Wara, a Stanford law professor who focuses on energy and the environment, called California’s climate goals “unprecedented.”

“People outside of California who work on these issues see that target and say, ‘What? Are they joking? That is insane,'” he said.