The Second Law of Thermodynamics anticipates the gradual energetic decay of physical closed systems (“entropy”). Arguably, the Universe all together is precisely this type of system.
In your area, even though, order is often fighting disorder for dominance. In other words, in localized, open systems, order occasionally tends to increase and, by definition, statistical entropy has a tendency to decrease.
Some physical systems raise disorder, frequently by means of decaying or by actively spreading disorder onto other systems. Such vectors we call “Entropic Agents”.
On the other hand, some physical systems increase order or minimize disorder either in themselves or even in their environment. We call these vectors “Negentropic Agents”.
Human Beings are Negentropic Agents gone askew. Now, through its excesses, Humanity is slowly but surely being transformed into an Entropic Agent.
Antibiotics, herbicides, insecticides, pollution, deforestation, etc. are all damaging to the environment and lower how much order while in the open system that is Earth.
Nature will have to stabilize this shift of allegiance, this deviation from balance, by constraining how many other Entropic Agents on Earth, or by minimizing the numbers of mankind.
To achieve the latter, which usually is usually the path of least resistance and a typical self-regulatory mechanism, Nature can cause humans to begin to internalize and assimilate the Entropy that they themselves produce. This is accomplished through a series of intricate and intertwined mechanisms:
The Malthusian Mechanism- Limited sources lead to conflicts, starvation, health conditions and also to a decrease in the populace (and, thus, in the amount of human Entropic Agents).
The Assimilative Mechanism- Conditions, old and new, and other phenomena yield adverse demographic results specifically connected to the entropic actions of human beings.
Examples: excessive use of antibiotics leads to drug-resistant strains associated with pathogens, cancer is a result of pollution, heart ailments are related to modern Western diet, AIDS, avian flu, SARS, as well as other diseases are consequence hitherto unidentified or mutated strains of viruses.
The Cognitive Mechanism- Humans limit their own propagation, using “rational”, cognitive arguments, devices, and procedures: abortion, birth control, the pill.
Thus, combining these three mechanisms, nature controls the damage and disorder that Mankind spreads and restores equilibrium to the terrestrial ecosystem.