The 2013 Chevrolet Spark on display at the North American International Auto Show, Detroit, Michigan, USA, North America

The Nissan E-NV 200 concept electric van on display at the North American International Auto Show, Detroit, Michigan, USA, North America

The 2012 Toyota Prius plug-in hybrid on display at the North American International Auto Show, Detroit, Michigan, USA, North America

The Hyundai Genesis on display at the North American International Auto Show, Detroit, Michigan, USA, North America

A Smart car designed by "Bill the Artist" on display at the North American International Auto Show, Detroit, Michigan, USA, North America

The 2013 Chevrolet Sonic RS on display at the North American International Auto Show, Detroit, Michigan, USA, North America

The BMW i8 plug-in hybrid concept car on display at the North American International Auto Show, Detroit, Michigan, USA

The 2013 Honda Accord concept on display at the North American International Auto Show, Detroit, Michigan, USA, North America

The Volkswagen e-Bugster concept plug-in electric vehicle on display at the North American International Auto Show, Detroit, Michigan, USA, North America

The BMW i8 concept plug-in hybrid on display at the North American International Auto Show, Detroit, Michigan, USA, North America

Two Chevrolet electric cars on display at the North American International Auto Show; the yellow EN-V pod-like car is a concept; the red Volt is in production, Detroit, Michigan, USA, North America

The 2012 Ford Focus electric car on display at the North American International Auto Show, Detroit, Michigan, USA, North America