Reuters: The U.S. economy could generate 4.2 million new “green” jobs in the next 30 years, about 10 percent of all the jobs created, according to a study for the U.S. Conference of Mayors released on Thursday. The study found the United States now has about 750,000 green jobs, which generally involve producing renewable energy or providing engineering, legal or research support. That figure represents less than 0.5 percent of all current U.S. jobs, said Global Insight, the economic …