Chemtrails vs Contrails(химтрейлы,химиотрассы)

A short video showing that Chemtrails and contrails are not the same thing. This spraying program of the atmosphere is occurring world wide, and our governments refuse to tell us what this is for... What has been found in chemtrails varies with all sorts of toxic metals such as Barium found. What is this for? population culling, weather modification, biological warfare, weakening immune systems, etc. or could it be a combination o