When there are not enough predators to control the prey, nature adjusts. When there are too many rabbits, a disease appears at regular intervals and reduces their population. Man has learned to negate the usual controls present in nature. We no longer prey upon one another at a rate sufficient to control our numbers. Animals that prey on man have been eliminated, or their impact has been diminished.
Medical science permits man to live, and reproduce, to a great age.
Infants that were never intended to survive, are now rescued by modern medicine. Nature's primary form of control, disease, no longer kills enough humans to maintain balance. The current situation, if unchanged, will lead to one of two results. Along the way, many other species of plants and animals will be driven to extinction. Wars will be fought over the basic necessities of life.