Aussie Bob, you forget that most of the people on this forum are aviation experts, something that no chemtrail believer is.
Therefore they know the practical difficulties, nay impossibilities of doing what chemtrail believers is happening.
As an example, the following link is a scientific study done back in 1972. Its prosaic title masks an undeniable truth. Chemtrailing is impossible because no aircraft can physically lift the weight of ice contained in a mature persistent contrail. Therefore, to make a "chemtrail" which contained enough say, aluminium to make a trail of the same opacity as a persistent contrail, the weight of the chemtrail would be up to four times more.
Read the abstract:
http://="http://ciresweb.colorado.ed...llenberg72.pdf
A mature persistent contrail that lasts for an hour contains up to four orders of magnitude the weight of water (ice) that can be expected to be emitted from the exhaust due to the combustion process. That means for a mature persistent contrail from a 747, over 100,000 tons of ice (that is not a misprint) is contained in it.
A 747 weighs approx 400 tons fully loaded.
You tell that piece of hard science to any chemtrail believer and you get a uniform response... They ignore it. You tell them all the other bits of aviation arcana that also comprehensively destroys the theory, they also ignore that as well.
They are not interested in any hard science that refutes their beliefs. They are somewhat similar to religious fundamentalists in that regard.
So, what do you believe?