Cleaning up an engine’s act


“One of these dirty three-wheel taxis in India or the Philippines produces the pollution of about 50 modern automobiles,” says Bryan Willson, a professor of mechanical engineering at Colorado State University in Fort Collins. “And you’ve got 50 to 100 million of these in Asia, so you’re looking at over 2.5 billion car-equivalents of pollution. So that’s a huge environmental impact.”