Because the current population is on the increase. An intrusion Destruction of natural areas is increasing as well. There is a lot of deforestation to build housing. And the power consumption increases, many fold. Especially in the industry. This is important in the carbon dioxide. The Transportation and activities that human action. Such as the burning of fuel. This will cause carbon monoxide harmful to the body, The Waste incineration, Burning Forest for agriculture. The activities of man have committed. These are the cause of the increasing amount of greenhouse gas that contributes to global warming.