By Dan Shapley
To increase its dwindling share of the U.S. car market, Ford is promoting its environmental chief to the top of the corporate ladder, in hopes a green strategy can help the company succeed. Ford has been criticized for being slow to recognize that more and more consumers are choosing cars based on fuel efficiency and low emissions. It's fleet is heavy with trucks and SUVs, and light on hybrids and compacts. Toyota, which has invested in the Prius and other efficient models, was the world's top automaker in the first quarter, selling 2.4 million vehicles. Ford was third, behind GM. One goal Sue Cischke, the newly promoted senior vice president for sustainability, environment and safety engineering, said is easily attainable: An affordable 40 mpg car.