And on the other hand when a giant meteor crashed into the Earth tens of thousands of years ago throwing up a dust cloud to cover the entire planet and force an ice age the likes of which had never been seen before, wiping out most of the dinosaurs and living creatures on the planet, what happened?
That's right, the Earth bounced back, recovered and gave us what we have now.
I wouldn't worry too much about killing our planet, it's already showed how resilient it can be in the face of adversity.
I think what people are worrying about is killing off the human race, but to be fair, how arrogant is that? Who decided we should be the dominant species any way?