Is a man the killer of the planet?

The changing climate is the scientifically established fact already. Significant long-term risks, including melting ice in Greenland and West Antarctica, the drastic reduction of biological diversity and change of direction of the Gulf Stream can seriously alter weather patterns and constitute a threat to humanity as a whole.
Among the causes of the climate change scientists call the offset of the orbit and tilt of the Earth, changes in solar activity, volcanic eruptions, increasing atmospheric concentrations of greenhouse gases, changes in land use. Last but not least is the role played by urbanization: today in about half of the world's population lives in urban areas, though the city with a population of 1 million people a day "produces" 25 tons of carbon dioxide and 300 tons of sewage. In addition, the mega-cities air temperature is slightly higher because of the large number of "hot" objects (buildings, machines). So, it is not a surprise that "global warming" is often associated with growing industrial activities.
Some scientists deny the fact that it is a man who is the main cause of this catastrophic climate change. But his deeds often lead to changes in the nature, do not they? What it is: the revenge of nature for the fact that people abuse its resources too actively? Or is the problem of global warming not so terrible as it may seem? Currently, predictions are such that humanity may soon be in a position of the heroes of the movie "Water World", where the disaster of almost all land was under water due to melting polar ice.