In the 1973 futuristic mystery thriller Soylent Green there’s an exchange between Detective Thorn (Charlton Heston) and Hatcher (Brock Peters):
Det. Thorn: Ocean's dying, plankton's dying . . . it's people. Soylent Green is made out of people. They're making our food out of people. Next thing they'll be breeding us like cattle for food. You've gotta tell them. You've gotta tell them!
Hatcher: I promise, Tiger. I promise. I'll tell the Exchange.
Det. Thorn: You tell everybody. Listen to me, Hatcher. You've gotta tell them! Soylent Green is people! We've got