As a good friend of mine once said, "Save the planet? More like save the humans! The planet has survived worse than us and will again."
To quote A.C. Clarke, "It has yet to be proven that intelligence has any survival value."
And Ripley in Aliens II: "You know, I don't know which species is worse. You don't see them screwing each other over for a fu*king percentage."
Humans deserve to perish. In accordance with even the most basic tenets found in Darwinism, the successful will adapt and survive. I guess that means cockroaches...