What is the greenhouse gas from any source?

Greenhouse gases "is a word that translates from French Gaz à effet de serre English and Greenhouse Gas. Khmer word "greenhouse gas" (gas or greenhouse effect) does not seem to have a meaning that can be understood to download immediately linked to the warming of the planet. This is because the country lies in the tropical heat. That is why they do not see any "greenhouse" (Serre Greenhouse) to grow food. In Europe and in North America, the cold weather to be able to grow plants that need warm weather, they need to be planted in Greenhouses. The house is made of glass lets the sun shine into and at the same time can not contain a sunscreen to go out emissions, making the temperature in in a greenhouse was increased. Greenhouse gases also have a similar mechanism. This gas is present in the atmosphere around the planet, and can hold a sun not to go out emissions. In fact, greenhouse gases, including water vapor (H2O), carbon dioxide (CO2) and methane (CH4) in the atmosphere around the earth, nature long ago. According to scientists, if the atmosphere around the planet without greenhouse gases the average temperature on the planet as a whole is lower than the current level until the to 30 degrees Celsius, making the life of people, animals and plants on the planet is hard to live. This means that greenhouse gases are favorable conditions for life on the planet. But if so, why, when present, they blame the greenhouse gases that cause that lead to climate change, which can causing the destruction of humanity? In fact, what makes them worry now is not greenhouse gases, which have no natural greenhouse gas, which comes from human activities, and to In addition to the existing natural gas. When greenhouse gases in the atmosphere, the more it can hold more sun, making temperatures on the planet higher. Scientists, climate experts generally estimated that the main greenhouse gas that comes from human activities is carbon dioxide, which is the source machinery mainly from coal and oil-powered machinery industry in coal-fired electricity plant vehicles.. And.. Deforestation is the cause that led to carbon dioxide in the atmosphere increased. Whereas agricultural activity is the main source of methane emissions. In terms of individual sectors, an average worldwide greenhouse gas emissions into the atmosphere the most is the energy sector (the activity production of electrical energy), then the order is the forest industry sector, agriculture and transport sectors last is the residential and commercial sectors. In a study on the evolution of greenhouse gases in the atmosphere, scientists have found that since the industrial revolution in the 18th century so far current levels of carbon dioxide in the atmosphere has increased by more than 40%, while methane increased from 150% to 170% range. What makes them worry even more is observed in the current amount of carbon dioxide in the atmosphere is high the most they've ever seen in approximately 80 thousand years ago. At the same time, releasing more carbon dioxide into the atmosphere by human activities continues to rise relentlessly.