"Cynic" wrote in message
...
On Fri, 28 Aug 2009 20:20:26 +0100, Cherry Chapstick
wrote:

Ships use so much more fuel per passenger mile that they just don't come
into the equation.

cite, please

http://en.wikipedia.org/wiki/Fuel_ef...transportation

Spacecraft are potentially the most fuel-efficient mode of transport
in terms of passenger-miles per gallon of fuel.

Now you have done it, a direct reasoned attack on the common, but erroneous,
belief that buses, trains, etc are better (regarding pollution) than cars
and planes.
There was one guy on the radio that claimed barges were better as they only
used a gallon an hour, but they do only do three miles per hour.