Assuming that chemtrails are real

didn´t it all start as some PX conspiracy, as in "blocking the view at the sun"?

I do not think there is anything to it,but I did have a theory...

The planes were spraying pollutants over wild areas.Conservationists wish the land to be preserved pointing out the wildlife habitat.If the developers destroy the ecosystem there,then there is nothing to preserve.
Notice amphibians dying off?The ground water is polluted.

I think it has something to do with the sun. Artificial cloud cover for whatever reason.

just search the forum - there are already plenty of threads on this topic.