Tracy,

Exactly. I didn't watch the ad I assumed it was in a language non-comprehensible to me, so I don't know what alternate form of transportation it was advocating. And short of a fully solar powered vehicle or a sailboat (ignoring the green house gases used to manufacture the vehicles and the toxic residues created by the production of solar cells) there ain't no greenhouse gasless mode of transportation.

>How does that compare to the greenhouse gases if all passengers on a single plane were driving in autos instead?