Consider the following problems: Overcrowded public highways, overfishing in the ocean, polluted air, and the near-extinction of the wild rhinoceros. What do these problems have in common?

They are all the result of having open access to the resource. No one can be excluded from consuming it.

the animal that would be cutest if scaled down to the size of a cat? elephant

not only is it colder, it also becomes darker, less salty, and more dense.