Why electric cars are only as clean as their power supply

Experts argue whether electric cars are worse for the environment than gas guzzlers once the manufacturing process and batteries are taken into accountJorge Cruz has just finished his overnight shift stacking shelves at Whole Foods in Los Altos, California, and is waiting at the bus stop outside. Like much of Silicon Valley, there’s a regular flow of Tesla, BMW, Nissan and Google electric cars that cruise past from their nearby headquarters, and Cruz rather likes them.
“I really woul