1. The prophetic and prescient film from 1982, and very depressing because it is real and ongoing,

regarding our planetary ecosystem and biosphere = Life on Earth.

https://en.wikipedia.org/wiki/Koyaanisqatsi

Full movie is free on Youtube, as 10 minute segments; very powerful and depressing

A call to action...

https://www.youtube.com/watch?v=i4MXPIpj5sA