The point is that environmentalists are not so much concerned about noise or pollution levels of some aircraft types. Their main argument is that there is a lot of "unnecessary" air traffic going on.
Of course, these exact people still want to use the latest computer hardware, eat exotic fruit and take part in fancy self-experience tours, visiting the Himalaya.
OK, I am simplifying the problem a bit, but you get my point. If you're enjoying the positive sides of our "modern world", you gotta accept some of the negative side-effects.
On an interesting side-note, a poll amongst German voters has demonstrated that people voting for the Green Party are likely to go on vacation more frequently and to more distant places than voters of "ecology-unfriendly" parties.
Homer: Facts are meaningless. You could use facts to prove anything that's even remotely true!