These are necessary for the existence of nature. Otherwise biological cycle will break. For eg. there is a forest and so many deers. If there is no any lion or tiger in the forest deer will live freely in the forest and the plants become disappear, and other primary consumers will die. But if there is a lion only some deer will survive.
But human are destructing the nature by so many bad practices. The increased use of vehicles, air condition, plastic etc. are the cause of global warming. Due to this climate will change and it also effect human.
Nature could do the same to humans, with water or other needed substances running out. Also, all the chemicals, such as the weed-remover, that we use in nature could cause our species to be eliminated. We could cause nature to be so unhealthy with these chemicals that it causes us to be unhealthy enough to be removed. For example, children long ago used to have peanut butter and jelly sandwiches, but now the chemicals used in peanut-growing areas have caused peanuts to be fatal to certain humans.
But with all the wars and other problems in just mankind alone, we could kill ourselves off before nature...
Humans will kill them selves before the Mother earth does.
Nobody knows or could possibly know for a long time to come.
In the history of man, nature has a way of removing species and substances from things that aren't suppose to be there or are destructive to Earth. Oil spills for instance, Nature always finds a way to remove it(Completely overtime). Will Nature do the same to Humans?
