I wouldn't be surprised if we were and caused the next mass extinction.
A biosphere such as earth can only hold so much of one species, there's always a population carrying capacity. Unfortunatly humans have the ability to change thier enviroment to suit their numbers.

But there are certain natural resources we need to live, like oil and such. As you notice that's running out so...
either we go to another planet and use up it's resources...or ?

Sorry, tired of thinking now lol

-Kitty