> if you don't the trolley and it's passengers will go in circles for eternity I interpret that as the passengers would live their natural life-span and then t

> if you don't the trolley and it's passengers will go in circles for eternity I interpret that as the passengers would live their natural life-span and then their rotting bodies would go in circles for eternity. Replace the trolley with planet Earth and it's no different from regular life. (approximating eternity with life of the Sun).