Predictive Cinema: The Omega Man (1971) & Soylent Green (1973)
The Omega Man: "Due to an experimental vaccine, Dr. Robert Neville is the only survivor of an apocalyptic war waged with biological weapons."
Soylent Green: "By 2022, the effects of overpopulation, pollution and climate catastrophe have caused severe worldwide shortages of food, water and housing. Soylent Industries controls the food supply of half of the world."