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Greenhouse emmissions are carbon dioxide, a colorless odorless gas. Any smog you see is something else.
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Where i live, car exhaust is not odorless and colorless. It would be if the hydrogen motors were out there.
In Mexico city it wasn't either, and sometime it was even recommended not to go out. Same thing happened when i was in Paris. The cool thing about pollution is that you don't have to go to school when it's too high.
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I do not see all of usa going completely nukular, yah that'il be the day. so we will waist all of our methaine supplies and then have to go back the gasoline in about 3 to 5 years.
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What about wind, hydraulic and solar energy? This can be used to make hydrogen fuel cells. The most advanced Country in this field of research is Island (sp?), where they have a lot thermal energy at hand.
Also, this is a long process. You start by reducing the use of oil by making cars more efficients, boosting the taxes at the pump to finance public transport (no i'm not communist) etc...