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California has established itself as a global model on climate issues, with Teslas filling its roads and solar farms stretching across its sun-baked Central Valley.
The state set up the nation’s first economy-wide cap-and-trade program, put in place aggressive vehicle fuel efficiency standards, and passed a series of ever stricter climate pollution rules. That includes the landmark 2018 law requiring all of the state’s electricity to come from carbon-free sources by the end of 2045.
But for all its regulatory achievements, California also offers a case study in just how hard it is to make progress on the only thing that really matters: reducing emissions.