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The interior view of a Tesla Motors Inc. Model S P90D, a model with some autopilot features, is seen during an exhibition featuring several self-driving cars outside of the Dirksen Senate Office Building in Washington, D.C., U.S., on Tuesday, March 15, 2016. — The interior view of a Tesla Motors Inc. Model S P90D, a model with some autopilot features, is seen during an exhibition featuring several self-driving cars outside of the Dirksen Senate Office Building in Washington, D.C., U.S., on Tuesday, March 15, 2016.
Photographer: Drew Angerer/Bloomberg

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By Anna Hirtenstein

September 20, 2016 at 3:00 AM UTC

This article is for subscribers only.

How much cleaner are electric cars than the fossil-fuel powered alternative? The answer depends on exactly where you charge the batteries.

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