At the risk of repeating myself, peak oil and EROI are things you need to know about:
https://www.youtube.com/watch?v=gWC5SJjBdqc
...and a book I've had on my shelves, and promoted, for years, describes how complex societies need more energy - which we haven't got:
https://www.youtube.com/watch?v=jxM-Vexnhv8
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