time future many aware it day now final movie legendary actor edward g robinson solent green becomes landmark classic many film buff environmentalist believe eventual history movie taken novel entitled make room make room whos working title changed solent green story concerns earth evolves future worlds environmental problems becoming nothing short catastrophic planets natural resources exhausted basic food reduced simple staples come variety colors solent yellow solent red solent green however know real ingredient solent green cringe culpability fear divine retribution first food executive named william r simonson joseph cotton upon death dedicated police detective called robert thorn charleston heston seeks truth behind apparent suicide although corruption goes way top begins simonsons bodyguard tad fielding chuck connors security chief donnovan roy jenson target thorn waste desposal factory thorns boss lt hatcher brock peters believes suspicions warns higher hot want case closed thorn risk job easy way out thorn discovers marks death like film awaits final warning 