Today's alarming rate of urban development is propelled by a rapidly growing human population. We are looking for more resources and taking more and more from Nature. What we need is to control the human population growth, and start a gradual decline to a sustainable level. Only if we do this will populations of other organisms have any chance at all of persisting. One of the five Iron Laws of Conservation, in fact, is that continued human population growth and conservation are fundamentally incompatible.
So it might be wise to think more on this problem and think of what you can do to help to human population explosion. And remember that it is not just how many people there are, but also how they live that determines the overall quality of our ecosystems.