There are seven fundamental principles that nature operates from, and whenever you deviate from these principles you end up with agony and disease. Nature is retributive, so far I haven't seen anybody get away with anything, there might be a delay between your action and the consequences of your actions, but you can be sure that you will pay for everything.
Self preservation (put yourself first)
Don't take more than what you need
The most powerful dominates the week
Power corrupts everyone
Competition controls corruption
Everything has polarity
Everything is temporary
The opposite of natural law is artificial law, it is not independent of natural law but you can build an artificial world on top of nature. Because of that you end-up with two sets of consequences, the natural consequences, like for example you are still going to age and die, and on top of that you are going to suffer the artificial consequences like get cancer, which is generally caused by human putting large amounts of harmful chemicals in nature.
Sacrifice yourself for others (collectivism)
Consume as much as you can (consumerism)
Dominate others with aggression
Claim as much power for yourself (dictatorships)
Eliminate competition (monopoly)
Eliminate polarity (androgyny)
Try to achieve permanency
There is a case to make about people returning back to nature, at least if you wan't to avoid some of the negative effects of man artificial law. People are sadly confused and think that in order to return to nature we have to go back in the forest and live in trees.
Not everything that humans make is artificial, we are not the only animals that build objects to serve ourselves. Why do we consider a bird's nest natural and a car artificial?!
They are basically both objects made by animals, by taking prime matter from nature, subjecting it to a series of chemicals and physical processes and rearrange it in a way to serve the needs of that animal.
The birds nest follows the rules of nature, it requires some destruction and labor to build and maintain but because it follows the laws of nature those two are kept at a minimum.