What is the relation between man …

For all the odd answers you’ll get to this question, in practice… humans are nature. In fact, we’re the personification of nature and the reasons why we cause so much damage to the natural world are expressly because of that very point.

In the natural world, creatures, plants, or any form of life will expand to make use of all resources in their entirety, plus a bit extra beyond that. If there’s more food available, you will invariably get more and more deer until there’s too many deer to support, and then they’ll either be eaten by predators, or starve, or both. If there’s too many deer, this turns into there being more predators, but then with more predators, they do the exact same thing - they produce more predators than there are deer to support them, until they starve or get killed by other predators.

This is very much so the nature of evolution - procreation is based around making as many copies of yourself as possible which survive long enough to make more copies of themselves as well. The fittest creature for a given context will almost invariably produce more offspring which live longer than previous generations could manage, such as by having a mutation which allows it to survive on less food, or to run faster to catch prey or avoid predators, or any of a huge number of possibilities. The thing is though, that the very nature of evolution ensures that the creature will produce more than is sustainable, and then the less-fit versions of that creature will die off, and presumably the one which was most fit for the situation is all that’s left, causing a cycle of overpopulation and culling.

Humans do this exact same behaviour, except we do it better than other species are capable of due to our advanced tool usage, which is totally a natural trait. What’s the difference between a human dam and a beaver’s dam? The difference is a human dam is less likely to completely ruin the local ecosystem oddly enough. It’s a much bigger scale, but also has a much better grasp of the harm that can be dealt and so we add functionality to mitigate the harm done.