The gases greenhouse gas emissions are:
· Carbon Dioxide (CO2) - Combustion of fossil fuels: oil, natural gas, coal, deforestation (release CO2 when burned or cut).
· Chlorofluorocarbons (CFCs) - are used in sprays, aircraft engines, plastics and solvents used in the electronics industry. Responsible for the destruction of the ozone layer
· Methane (CH4) - Produced by fields, and cattle and the dumps.
· Nitric acid (HNO3) - Produced by the combustion of wood and fossil fuels, by decomposition of chemical fertilizers and by microbes
· Ozone (O3)-It is caused by soil pollution caused by factories, oil refineries and automobiles

The gases responsible for global warming of the Earth are in the combustion of fossil fuels such as oil and its derivatives.
-Cars are responsible for the release of carbon monoxide (CO) and carbon dioxide (CO2), nitrogen oxides (NOx), sulfur dioxide (SO2), derived from lead and oil.
-The industries also account for this since emit sulfur, lead and other heavy materials and solid wastes that are suspended in the air, turn the concentration of oxygen is being increasingly less what is going to cause serious illness in the system nervous, cancer, respiratory problems.
-In agriculture, the substances are originated from the cultivation of rice in the burning of agricultural waste and forests. -The incineration of waste and disposal of solid waste on the land are other sources of greenhouse gases.

The action of human beings in nature has made increasing the amount of carbon dioxide in the atmosphere, through an intensive and uncontrolled burning of fossil fuels and deforestation. The felling causes the increase in the amount of carbon dioxide in the atmosphere by burning and also by natural decomposition. A smaller number of trees also means less carbon dioxide being absorbed.

EFFECTS CAUSED
Global warming could lead to the occurrence of climatic variations such as changes in precipitation, increase the level of the oceans (melting), heat waves. Thus it is natural to register to an increase in cases of flooding which will consequently increase the mortality rate on earth. A profound change of climate will have a disastrous impact on societies affecting agricultural production and reserves of water, resulting in economic and social change.
The climate change will probably increase the frequency of days of intense heat, which is an increase in the number of deaths.