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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.

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Electric cars are only "zero emission" if you believe that the electricity you use to charge them comes from the electricity fairy. Or if you have a wind farm and/or a bank of solar collectors in your back yard that provides all the charging power (better have a big back yard).

Electric vehicles (at least those currently available based on lead-acid battereis) are also slow and have short range and long recharge times.