Aright, let's get it straight... there is no such thing as good or evil, as it is a man made concept in order to more easily understand certain ideas. Instead, we can only see what is disadventagous to others, and adventagous to others, or vice-cersa.
We, as animals, use whatever means necessary to make sure our needs or wants become reality. Therefore, we are not "bad' when we pollute. We are only as bad as the fox who eats the rabbit. The fox was hungry, and we wanted to live comfortably, so we both did what we had to do to make that a reality. Overall, humans are not bad, we are just using our knowledge in ways that is not benfecial to the planet as a whole.