Yet that human complexity was often created to help us deal with natural complexity.

Nature is indifferent. One year may produce an overabundance that the hunter/gatherer may take advantage of, yet the next year may be opposite and people will die from famine. So we learned how to preserve food as best we could. Yet that would result in a growth of population, an over population based on the resources available, so we learned how to grow our own food and manage livestock in order to avoid famine. That encourages the development of settlements. With denser populations disease is able to thrive, and, with trade, it is able to spread. So we learned how to manage waste. Each new development brings new pitfalls since we are meddling with the balance of nature. Or perhaps it is better to say that things are being balanced in new ways, so we must learn how to adapt to that. (We are, after all, a part of nature.)

Sometimes we adapt to those changes in balance in ignorant and extraordinarily damaging ways. I am not denying that. On the other hand, not trying would have hindered the development of intelligence -- or, perhaps, resulted in our extinction.

Maybe natural complexity is not supposed to be something we deal with, just something we live with. Adapt ourselves to, move in harmony with, rather than trying to adapt nature to our whims. The trees and rocks and rivers really do have things to say to us; maybe our duty here is just to shut up and listen.