Another culprit is the continued robbing of the forests through the means of deforestation. Those trees are meant to act in a way that turns the CO2 into breathable oxygen for human consumption. Most importantly, the industrial nature of the modern world has served as a means of killing the natural world that is forced to co-exist with it. The technological desires of mankind has forced the Earth into a tailspin that, if not caught, will continue to force it into a continued destructive phase that will ultimately tear it apart at the core.
With the increase in human population and other expansion, it has increased the need for building that has taken small cities and built them into metropolises of great grander. These Cities feed the advancement of man, without any kind of thought to the environmental damage which is inflicted upon the Earth. As many know, greed itself sells. Humanistic nature overwhelms, as well as strangles, in most cases, the needs of those things around them, especially in the precious environment that is drowning as each day goes by. The desire of people for their own self serving interests takes hold and crushes anything in its surrounding path that may interrupt that.