A few weeks ago, California’s clean-air regulator flew from Los Angeles to St. Paul, Minn., to give a speech. A crowd of 600 environmental activists had gathered to talk about the importance of speeding up the transition to electric cars.
“I think our two states, California and Minnesota, will be able to do a lot together,” said Mary Nichols, chair of the California Air Resources Board.
This is what environmental diplomacy looks like under President Donald Trump, with powerful state-level...
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