We are dependent on the environment to survive. If we mess it up too much, it will kill us. The Earth doesn't need saving. It will be fine for a few billion more years. Whether any of our descendants survive to see it is the question.

I understand what you are saying. On the other hand, dare I saw, it is a defeatist approach. You could extend it to saying that we can drop nuclear bombs around and as the world is independent to our actions, the world at large will adapt - some species will survive and change over time, and although human civilisation will end, the Earth is bigger than us and it will keep going.
The problem is that our actions are ^not^ independent to us. We are year by year destroying life on the planet. As someone posted earlier, we have almost completely replaced all mammal mass with both ourselves and our livestock. Yet the rate of species extinction alone is astronomical.
The first step (necessary but not sufficient) is an awareness of what we are doing, which we are sort of in denial about on the whole. I think there is nothing wrong with stating everything to make it clear, as we can only then talk about remedies and have the power, strength or initiative to slowly steer out Titanic away from self destruction. I think that isn't a bad way of putting it because it is really hard to change cultural momentum but it doesn't mean we are a slave to this momentum.