YES! You too can be added to the APOD PING list! Just ask!
Thank You.
Contrails have become more than an oddity - they may be significantly increasing the cloudiness of Earth, reflecting sunlight back into space by day, and heat radiation back to Earth even at night.
So contrails are a problem by saturating the surrounding air with extra moisture by increasing the cloudiness of Earth, reflecting sunlight back into space by day, and heat radiation back to Earth even at night.
Wait till millions of Hydrogen cars exhale harmless water vapor into the atmosphere all for the cause of clean air.