Chemtrails
Evidence below shows that chemtrails are not a mere conspiracy theory:

NASA Admits To Chemtrails As They Propose Spraying Stratospheric Aerosols Into Earths Atmosphere – Click on Image for more…
⇒ EXPOSED! Photos from INSIDE Chemtrail Planes Like You’ve NEVER Seen Before!
⇒ The United Nations Admits Geoengineering Via Chemtrails Is Real
⇒ A Pilot Confessed: We Sprayed Poisons And Now Our Lovely Sky Is Gone
If for some reason you still think this is a conspiracy theory, here’s undeniable proof: