Zero emissions vehicles do exist. They are electric vehicles or EV for short [img]/images/graemlins/smile.gif[/img] They are not currently available at reasonable prices in the US, but they're in Canada, Australia, Germany...

Check green car forums for more info.

Zero emissions power sources exist, too. Windmills and solar. Go to Palm Springs to see the windmills. They're awesome looking.

No one said they didn't exist. It's just they're not efficient and available yet.