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Charging plugs sit connected to Volkswagen e-Golf electric automobiles to an electric charging station outside the Volkswagen AG (VW) factory in Dresden, Germany, on Monday, April 3, 2017. Diesel cars' popularity in Europe has been waning as Volkswagen's emissions-test manipulation scandal, which emerged in late 2015, compounded concerns that pollutants from the fuel are outweighing the benefits of its lower CO2 emissions. Photographer: Jasper Juinen/Bloomberg via Getty Images

Charging plugs sit connected to Volkswagen e-Golf electric automobiles to an electric charging station outside the Volkswagen AG (VW) factory in Dresden, Germany, on Monday, April 3, 2017. Diesel cars' popularity in Europe has been waning as Volkswagen's emissions-test manipulation scandal, which emerged in late 2015, compounded concerns that pollutants from the fuel are outweighing the benefits of its lower CO2 emissions. Photographer: Jasper Juinen/Bloomberg via Getty Images

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Charging plugs sit connected to an electric charging station outside the Volkswagen AG (VW) factory in Dresden, Germany, on Monday, April 3, 2017. Diesel cars' popularity in Europe has been waning as Volkswagen's emissions-test manipulation scandal, which emerged in late 2015, compounded concerns that pollutants from the fuel are outweighing the benefits of its lower CO2 emissions. Photographer: Jasper Juinen/Bloomberg via Getty Images

Charging plugs sit connected to an electric charging station outside the Volkswagen AG (VW) factory in Dresden, Germany, on Monday, April 3, 2017. Diesel cars' popularity in Europe has been waning as Volkswagen's emissions-test manipulation scandal, which emerged in late 2015, compounded concerns that pollutants from the fuel are outweighing the benefits of its lower CO2 emissions. Photographer: Jasper Juinen/Bloomberg via Getty Images

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An electric automobile charging station, manufactured by Gildemeister Energy Soloutions GmbH, stands outside the Volkswagen AG (VW) factory in Dresden, Germany, on Thursday, Nov. 17, 2016. Volkswagen will target to sell as many as 400,000 electric vehicles a year in China by 2020 as regulators in the worlds largest auto market consider legislation to require companies sell a minimum quota of eco-friendly cars. Photographer: Jasper Juinen/Bloomberg via Getty Images

An electric automobile charging station, manufactured by Gildemeister Energy Soloutions GmbH, stands outside the Volkswagen AG (VW) factory in Dresden, Germany, on Thursday, Nov. 17, 2016. Volkswagen will target to sell as many as 400,000 electric vehicles a year in China by 2020 as regulators in the worlds largest auto market consider legislation to require companies sell a minimum quota of eco-friendly cars. Photographer: Jasper Juinen/Bloomberg via Getty Images

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A BMW i8 plug-in hybrid automobile, produced by Bayerische Motoren Werke AG, sits connected to an electric charging station at the IAA Frankfurt Motor Show in Frankfurt, Germany, on Wednesday, Sept. 16, 2015. The Frankfurt International Motor Show starts on Thursday, and nearly one million visitors are expected to view the latest must-have vehicles and motoring technology from over 1,000 exhibitors in a space equivalent to 33 soccer fields. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

A BMW i8 plug-in hybrid automobile, produced by Bayerische Motoren Werke AG, sits connected to an electric charging station at the IAA Frankfurt Motor Show in Frankfurt, Germany, on Wednesday, Sept. 16, 2015. The Frankfurt International Motor Show starts on Thursday, and nearly one million visitors are expected to view the latest must-have vehicles and motoring technology from over 1,000 exhibitors in a space equivalent to 33 soccer fields. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

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A Volkswagen eMobility Cube car sharing hire automobile, produced by Volkswagen AG (VW), sits connected to an electric charging plug in Wolfsburg, Germany, on Tuesday, Oct. 13, 2015. VW Chief Executive Officer Matthias Mueller faced employees at the German company's headquarters last week as pressure mounts to slash spending in the wake of the diesel-emissions scandal. Photographer: Krisztian Bocsi/Bloomberg via Getty Images

A Volkswagen eMobility Cube car sharing hire automobile, produced by Volkswagen AG (VW), sits connected to an electric charging plug in Wolfsburg, Germany, on Tuesday, Oct. 13, 2015. VW Chief Executive Officer Matthias Mueller faced employees at the German company's headquarters last week as pressure mounts to slash spending in the wake of the diesel-emissions scandal. Photographer: Krisztian Bocsi/Bloomberg via Getty Images