The way we dispose of dead bodies is harming the environment and causing climate change. The film shows two widely used (but bad) body disposal methods and talks about how they harm the environment. Then it presents a solution by showing a much better way you can dispose of your body when you die.
People who don’t really care about climate change always seem to say “what do I care? I’ll be dead in x amount of years”. But I say, you should always care about climate change. Even when you’re dead.