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As Volvo sees it, plug-in hybrids are the path toward achieving one of its high-aiming carbon-reduction goals—making fully electric cars half of its sales by 2025. To do so, the automaker plans to nudge its portion of PHEVs in the U.S. over the next 16 months, to 20 percent, up from about 4 percent today. But it also knows that plug-in...