When communicating with conspiracy theorists, it is important to understand and recognize their concerns, especially when some of their concerns are justified. It is important to tell them what are the concerns that we share.
Chemtrail believers' concerns about having less blue skies are justified; concerns about the possibility that geoengineering may be implemented without seeking international and public approval are also justified, and we can share these concerns with them.
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Shouldnt you be trying to convince the chemtrailists to stop using the term 'chemtrails' and to stop talking about 'spraying aluminum, barium etc' ?
I dont really feel the 'less blue skies' is justified in most cases. I live near one known chemtrailist who has published and he
way over exaggerates his claims and 'concerns'. I think enabling him to 'be afraid' when there is no evidence or scientific or observable data supporting his claims is cruel. And you confusing him doesnt help.
I'm also not concerned about 'international approval' because no wide spread program of any significance is going to be able to be implemented without other countries knowing ( or
actual whistleblowers). Countries keep tabs on each other and they have way more resources to do so then a bunch of online bloggers/facebookers and youtube movie makers.
I personally am not 'concerned' about contrails at this point in time because the scientists
are studying it. And as you have pointed out, they have been watching the contrail situation since at least 1970. So far the scientists havent found any significant impacts, but they are planning ahead and considering the options if the need arises. IF in the few locations around the globe that they do actually have one or two days a month of 'contrail cover' of any significance, it is up to those specific locations to decide what to do about it. re: crops or unhappy citizens.
And as I've said pollutants from cars, trucks, and buses actually
does have tons of scientific evidence of
significant harm and pollution, both globally and for many many many specific locations. If you can't motivate people to care ( ie. be concerned) about THAT, good luck getting wide spread caring about a few extra clouds in the sky!
Either way this isnt really the forum to discuss 'what if' scenarios except in Chit Chat to some extent.