Do you have a source that gives estimates of carbon output from vehicle shipping? I'm wondering roughly how many fumey-old-bug miles correspond to pre-owner new-car transport.
http://www.edn.com/electronics-blogs/readerschoice/4368147/A...
[1] Past personal experience: Many of the elderly people I have seen go through car crashes in which the airbag deploys experience injuries from the airbag that often lead to their death or convalescence. Of course, they would have fared no better without the airbag.
This has some interesting references: http://www.salon.com/2008/04/21/ask_pablo_cars/