If an alternative fuel along the likes of hydrogen has that many negative issues, why isn't CNG promoted as extensively as 10 or 15 years ago. The refueling infrastructure while tiny compared to gasoline, is huge compared to hydrogen. And stations are available nationally and could be up scaled fairly easily. I drove from DC to Oklahoma in a dedicated CNG powered car last fall and never had any worry of running out. And out in OK is costs 69 cents a gallon.