Caused by the increase of gas that envelops the Earth's atmosphere causing the Earth's temperature to rise. As a result, the seasons change. Global warming is a big problem in the world today. Observed from the Earth's temperature to rise. Are mainly caused by greenhouse gases. Greenhouse effect is vital to the world. Because carbon dioxide or methane will retain some heat in the Earth is reflected back into the atmosphere for all. The world becomes a frigid lunar night, the daytime heat. Because there is no atmosphere to filter the power from the sun. the major greenhouse gas emissions are to be reduced such as Carbon dioxide, methane , nitrous oxide gases .the increase of greenhouse gases at present due to the existence of human activities, such as Whether it is deforestation, The emissions of industrial facilities, The smoke from the exhaust pipe of a car,people use of a refrigerator or air conditioning because these appliances are coolant as a result of greenhouse gases and operated by the burning of coal, oil, natural gas.