gerv,
interesting point, but if you compare passenger miles the aircraft is probably more efficient than the single occupant vehicle being driven for that year ... that being said, all forms of infernal combustion need to be curtailed, whether planes, trains or automobiles. I have seen a theory that in the not to distant future carbon credits will be the new monetary standard...and I think cyclists will come out way on top with that one. Psst...wanna buy some unused carbon credits

Aaron