My youngest adult daughter, who is an environmental attorney in Colorado, has a tatoo! Yes, really. From this and other sources, I understand that the suspected source of US "greenhouse gas" emissions is not from vehicles but from industry. Our government has recently EASED polution standards for them. US standards for vehicle emissions are really rather restrictive -- enough so to keep all the fuel-efficient little Euro diesels out of here! And US safety restrictions have meant that we have no "city" cars (like the Smart) available. Plans to begin selling the Smart here this spring are now in doubt, so we may not get a "city" car any time soon. A shame, as we also have some crowded cities where these would be very popular.