How can you steel believe that's Contrails?
May be if you are a "Contard"...
Chemtrails are real. Geo-engineering existed since the Second World War, it is increasingly evident there're false sciences for serve those weather modification.
Do not be so categorical about what you've learned from science, even if it can blow the limits of understanding and breaking down all the scenery of life.
Science without conscience and good sense is the ruin of the soul.