We simulate Earth for several reasons. Economists to model the economy, meteorologists for weather, climate scientists for climate change, quants for financial models etc. The simulations within each class compete for greater and greater fidelity. By necessity, these models grow more complex, requiring more people, electricity, and data centers . Thus, the simulations themselves become a significant part of Earth. Thus, at some point, simulations of Earth must simulate themselves to achieve even greater fidelity. By induction, they simulate simulations simulating simulations simulating simulations ad infinitum.
Hence, reality is nested simulations . Or this is complete nonsense. Definitely one of the two.
- “In 2014, data centers in the U.S. consumed an estimated 70 billion kWh, representing about 1.8% of total U.S. electricity consumption” https://eta.lbl.gov/publications/united-states-data-center-energy
- In Charles Stross’ book Accelerando, all matter in the solar system is gradually devoted to computing, becoming what’s called computronium
- Obviously, other people have thought this but I’m too lazy to research so Wikipedia: https://en.wikipedia.org/wiki/Simulated_reality#Nested_simulations