There was a movie in the 1970s about a dystopian future where there was not enough food to go around. The main food company was named Soilent.

So it was coming out with a new product that would end hunger. It was made out of algae, and it was called Soilent Green.

Charleston Heston was the hero of the movie and he broke into the factory and figured out that it was actually made from dead people.