Pessimism or Reality?

I don't know if I am just being a pessimist, but it seems to me with this whole "Man Destroying the Earth" thing that we have going on, that our Earth is already destroyed and we just don't know it yet. Our society can say it will do what it can to overcome Global Warming, but the bottom line is that the only way to stop it is to radically change the world society (read; destroy it) Almost every world economy is based upon the very thing currently killing us, and too many of the people are unwilling to truly change anything. The Multinationals know this and are playing it up to boost their advantage and profits, at least until it becomes impossible. The only way anything will truly change is if the world's consumer economy is totally replaced with something else, with no trace of the previous economy. Am I a pessimist or what?