The gasoline-powered internal-combustion engine is a menace to the environment. Although cars are far cleaner than they once were, California and other states are now demanding that autos be emissions-free. And the industry is beginning to comply, offering a few models pristinely propelled by electric batteries. Car companies are not promoting the vehicles with nearly enough enthusiasm (for the moment, they'd rather sell profitable gas-gulping SUVs), but the industry can see a new era coming and is pouring big money into better technology. Here are profiles by Margot Hornblower of two independent thinkers who have helped point automakers in a different...
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