Over the past decade, California has passed a sweeping set of climate laws to test a contentious theory: that it’s possible to cut greenhouse gas emissions far beyond what any other state has done and still enjoy robust economic growth.

Now that theory faces its biggest test yet. Last August, the State Legislature set a goal of slashing emissions more than 40 percent below today’s levels by 2030, a far deeper cut than President Barack Obama proposed for the entire United States and deeper than most other countries have contemplated.

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“Each additional increment of carbon reduction is tougher than the previous one,” said Dan Reicher, director of the Center for Energy Policy and Finance at Stanford. He added, “California will have to reach deeper into the bag of technologies” to cut emissions from more stubborn polluters like oil refineries and cement plants.

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