[billysielu]

All the other critters manage just fine. People can too.

[darkwater]

Animals do it doesn't sound like a good reason to me. There is plenty of things humans do and animals don't and vice versa and it's perfectly fine.

[Turing_Machine]

The other critters, in general, evolved where they are found.

Humans live in all kinds of environments that are far removed from the East African Rift.

[vraid]

Lots of animals manage by either migrating to the tropics or hibernating through the winter. Neither is viable for a modern human society.