In message
, at
02:00:25 on Tue, 11 Oct 2011, Neil Williams
remarked:
You have to wonder just how many more flights will satisfy the aircraft
lobby. The sky is already a contrail polluted mess on most days

You do know what contrails are, right? They aren't pollution.

They are visual pollution, but a negative greenhouse factor

Though the aircraft will emit that as well.

Aircraft emissions are overall slightly greenhouse negative (which seems
to be the trendy "pollution" to worry about) but there's also a separate
poisonous effect, which because of the jetstreams lands mainly in south
Asia.
--
Roland Perry