MAN vs WILD

Some practise I did in the morning sparked off this thinking about man and what wild really meant. Somehow I get this nagging feeling that while we can boast of huge skyscrapers roads mega cruisers, breakthrough technology and even stuff that can prolong our lives, nothing we did was ever in the best interests of the very place we live in. Not denying my role in this cycle of destruction, I think that when in time to come, if man really disappeared from the Earth (be it extinction or some migration to other planets), we'd have left her in such a mess than when we first arrived.
nature may heal itself, everything may be back to what it was before, but this does not mean that we should have pushed her to the limits. Freak weather's are starting, and I think its getting pretty evident now. Even the very roads we built before seem to be crumbling under the pressures of our own devices (the standstill traffic jams common in moscow city, the aging heat vents of manhatten).
Nothing can last long.. if we in the first place had no intention of keeping it that way. When in abundance, we become extravagent without thinking, and when limited, we begin to suffer from the actions we had done before. Everything may well be a cycle of cause and effect, and now effects are taking a toll on us.
Man, the first animal to have done so much creation and destruction. Its so convenient to forget that we aren't the only ones on this Earth. Maybe we shouldn't be too proud of our rationality. After all, rational human beings litter, torture animals, and now kill each other. How proud can we be...