"Why Societies Collapse"

by the notable geographer, Jared Diamond.
https://www.youtube.com/watch?v=IESYMFtLIis
Diamond is the author of Guns, Germs, & Steel and several other books on the human condition.

This TED Talk is all about sustainability.  He uses examples from the distant Past and Modern Day.  The clip is from 2003, and is completely relevant today.
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Despite the deep denial by some people, we clearly are at the beginning of an eco-catastrophe of monumental proportions.  It goes way beyond fossil fuels, or green energy, or recycling, or the literal insanity of nuclear weapons & nuclear waste, or any number of other individual, "environmental" problems. 

This catastrophe also involves aspects of Human Ecology which we largely have been unwilling to face--- 
1.  a lack of ethics,
2.  social and income inequality,
3.  racism,
4.  the anachronistic stratification of social classes,
5.  the misinterpretation of "religion",
6.  a lack of spirituality,
7.  intolerance of "the other side",
8.  shallow values,
9.  ignorance of systems in Nature,
10.  the tendency to embrace opposition rather than cooperation,
11.  failure to recognize the degree to which we are propagandized, and
12.  the utter arrogance of the human species relative to other life forms on Earth.
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Professor Diamond shows us a methodology for analyzing our predicament, and educating others as to a way forward.  It's a hopeful message.
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Not only my opinion.  Stay Well