analysis by Toyota found that as much as 28 percent of the carbon dioxide emissions generated during the lifecycle of a typical gasoline-powered car can occur during its manufacture and its transportation to the dealer; the remaining emissions occur during driving once its new owner takes possession.
the new hybrids‚ despite lower emissions and better gas mileage‚ actually have a much larger environmental impact in their manufacture, compared to non-hybrids.
http://www.scientificamerican.com/ar...e-ecofriendly/