“Policy makers have been dithering about climate change since 1988, and in the background you have this steady progression of technologies,” Greg Nemet, a public-affairs professor at the University of Wisconsin at Madison, told me. Foreign industrial policy has driven that progression, he said, although American tax rebates—and California’s economic planning—have also played a part. Those policies have allowed the entire world to decarbonize and led companies to support ever more aggressive carbon cuts. That, in essence, is the green vortex.
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