Basically, in physics, the arrow of time comes from entropy. The second law of thermodynamics states entropy only goes up, which means disorder in the Universe only goes up, which means concentrated free energy only goes down. If you look at living things (humans, plants, civilizations, what have you) these systems are locally reversing entropy. Humans locally reverse entropy because we have action. In the process, we globally accelerate entropy until the heat death of the Universe. You could come up with some fanciful theory, which I like, that we’re headed towards the heat
