Sharing a planet with limited resources with 8 billion strangers

Bill splitting exemplifies game theory at its core, mirroring the challenge of sharing limited resources with 8 billion people on Earth.

When splitting a bill, do you act fairly, ordering just enough to satisfy your hunger, hoping others do the same so the shared bill aligns with what you consumed? Or do you indulge in expensive dishes and drinks, aiming to pay less than you would if dining alone, counting on others to order modestly?

Similarly, in a world with 8 billion strangers, do you minimize your environmental footprint, even though it requires more effort and less indulgence, hoping others will do the same so resources last longer? Or do you embrace excess, reasoning that if you don't consume these finite resources, someone else will?