I made an ultra low budget 50 min. documentary about contrails and their effects on nature, global warming and the economy. When it was almost finished the Coronavirus had an enormous impact on aviation, resulting in blue skies.
https://www.youtube.com/watch?v=X1iIYOXa8o8
Enjoy!
https://www.youtube.com/watch?v=X1iIYOXa8o8
Enjoy!