Toyota is pitching the Mirai hydrogen fuel cell car as a godsend for the planet. Heat and water are its only byproducts, not climate-altering carbon dioxide. But just how clean is that exhaust water vapor?
Toyota is pitching the Mirai hydrogen fuel cell car as a godsend for the planet. Heat and water are its only byproducts, not climate-altering carbon dioxide. But just how clean is that exhaust water vapor?