Just when you may start thinking that ethanol might be a nice stepping stone between petrol and hydrogen, you see a study like this.

WASHINGTON — Switching from gasoline to ethanol — touted as a green alternative at the pump — may create dirtier air, causing slightly more smog-related deaths, a new study says.

Nearly 200 more people would die yearly from respiratory problems if all vehicles in the United States ran on a mostly ethanol fuel blend by 2020, the research concludes. Of course, the study author acknowledges that such a quick and monumental shift to plant-based fuels is next to impossible.

Full article (via DailyTech)