Reuters: Many of the world’s biggest automakers on Wednesday detailed ambitious electric-car plans that promise zero emissions but will demand patience from consumers and subsidies from governments to succeed. Nissan Motor Co, BMW’s BMWG.DE> MINI, General Motors Corp and Volkswagen’s Audi were among the automakers who promised, at the Los Angeles auto show, to bring electric cars to market in the next few years. Consumers have been clamoring for greener vehicles amid soaring gasoline …