Animals survived for thousands of years with very little encouragement or assistance from us. When humankind established itself as the dominant and most advanced form of life on the planet, we began enslaving and breeding animals for our own purposes. The net result of that is sights like this one, which can be found in most densely populated nations.
Intensified animal farming like this is unnatural. Animals never wanted or needed to be housed so closely together, or in such a concentrated or controlled environment. Placing so many cattle together in such a way is particularly harmful; it leads to concentrated doses of methane being released into the atmosphere, where it creates a chemical imbalance in the air. Moreover, we tend to remove forests to make room for these vast farmlands, disrupting the ecosystem that previously existed there in order to do so.