DesMoinesRegister.com reports that the Nevada and Sigourney schools districts in Iowa will be among 19 school districts nationwide that will test hybrid schools buses in the upcoming school year. The buses promise to significantly improve fuel efficiency and to reduce environmental pollutants. The buses will be delivered to the districts in November, and if they work as advertised, school districts across the nation will be lining up to purchase them. Supporters of the hybrid buses claim that they will provide a 40 percent increase in fuel efficiency. The only problem is that the cost of the buses is around $200,000. The Nevada and Sigourney school districts will pay around $60-65,000, while grants will cover the remainder of the cost…