Soylent_Green was quite a cautionary movie about a rough & lean future when it was released.
https://www.imdb.com/title/tt0070723 , https://www.youtube.com/watch?v=N_jGOKYHxaQ
https://www.rogerebert.com/reviews/soylent-green-1973
https://en.wikipedia.org/wiki/Soylent_Green#Plot
Soylent Green Documentary https://www.youtube.com/watch?v=qyizAHAbPII
Sci-Fi Classic Review: SOYLENT GREEN https://www.youtube.com/watch?v=d0bI-ZCEIzk
https://www.rottentomatoes.com/m/soylent_green
https://tvtropes.org/pmwiki/pmwiki.php/Film/SoylentGreen
https://www.tcm.com/video/78244/soylent-green-original-trailer , https://www.tcm.com/tcmdb/title/2061/soylent-green/#overview
https://mashable.com/article/2022-soylent-green
https://www.denofgeek.com/movies/soylent-green-predicted-2022-meat-substitutes/