China is escalating a trade dispute with the U.S. by imposing tariffs that could top 50% on solar-grade polysilicon, a key component for solar panels. The move follows efforts by the U.S. to protect its solar manufacturers from below-cost "dumping" by state-subsidized Chinese manufacturers. "It could effectively act as a bar to U.S. polysilicon exports to China in the short run. They're losing their largest export market," says John Smirnow of the Solar Energy Industries Association.
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