What would happen to earth if humans vanished?

[Teuthida]

The majority of all animals (unless they're domesticated... by humans!) live a life of prolonged suffering. They spend their entire time finding food, reproducing and raising their young.

Er...but that's what life is: suffering.

Many people do exactly that as well. You do a modified version. Though you might not seek out food directly, you work for a paycheck to buy your food to survive, reproduce, and raise young.

Seems foolish to think without humans animals would have it rough. One less thing to worry about for most of them. The ultimate predator would be gone.