PH, beware the establishment cover-up propaganda pedaled by the above government dupes.
It is a well known "fact" that these are the visible sign of a worldwide governmental conspiracy to subjugate the worlds proletarian population by means of noxious mind-altering chemicals sprayed from every commercial airliner, all of which have been secretly modified for the purpose.
If for any bizarre reason you chose to disbelieve me type "chemtrails" into your search engine, lock your front door and turn up the stereo real loud or your neighbours will call the men in white coats after the first hour of your hysterical uncontrollable laughter...
Great entertainment (if it wasn't so tragically sad)