Various: Gas prices have been dropping at a remarkable rate, but the auto world clearly is still thinking green. Whatever the future of the US auto industry, President-elect Barack Obama has said automakers should be “retooling for energy efficiency.” And as you strolled the aisles of the New England International Auto Show earlier this month, greener cars were to be found at every turn. But going green means something different to every automaker. A number of companies are rolling out …