&gt; roughly the same amount of greenhouse gasses per mile per person as a car<p>I see.  How much non-human cargo are these cars carrying?    More to the point:  how else do you propose one go from SF to Europe?<p>Reading between the lines, you&#x27;re either suggesting people stay home or that they take a boat, both of which are absolute crazy talk.<p>EDIT:  moreover, wikipedia&#x27;s numbers suggest jetliners get roughly 70 to 110 passenger-miles&#x2F;gallon (<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Energy_efficiency_in_transportation#Aircraft" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Energy_efficiency_in_transport...</a>).  I have yet to come across a car that gets that kind of mileage <i>period</i>, let alone per passenger.<p>Besides, gas turbine engines are pretty much the model of efficiency when it comes to hydrocarbon-consuming engines.  I don&#x27;t know where you people are getting your numbers but my BS detector is off the charts.