Homo sapiens.
We've hurt this world way more than we've helped it. Ozone layer is dying & pollution is killing animals. Is it selfish for us to continue to live? Are we the superior organism?
Well; when I think about it, as evil as it may sound, humans are one of the few animals that live the true 'meaning of life'.
Other animals only goal is to survive and repopulate: while humans explore fronteirs: live lives of luxury, experience love/hate/hapiness/sadness, and make advancements unfathomable to any other creature on Earth.
And though we have killed off animals in our existance... so be it.