what is the main source of greenhouse gases
Greenhouse gases are gases in the atmosphere that causes the greenhouse effect. The actual gases naturally occurring in the environment, but can also arise as a result of human activity.
Greenhouse gases are the most numerous is the water vapor that reaches the atmosphere due to the evaporation of water from the sea, lakes and rivers. Carbon dioxide gas is the second largest. It arises from a variety of natural processes such as: volcanic eruptions; the breathing of animals and humans (who breathe in oxygen and exhale carbon dioxide); and combustion of organic material (such as plants).
Carbon dioxide can be reduced due to absorption by oceans and absorbed the plant to be used in the process of photosynthesis. Photosynthesis splits the carbon dioxide and release oxygen into the atmosphere as well as taking carbons atoms.
Water vapor
Water vapor is a greenhouse gas that occurs naturally and is responsible for most of the greenhouse effect. Water vapor concentrations fluctuate regionally, and human activity does not directly affect the concentration of water vapor unless local scale.
Carbon Dioxide
Humans have increased the amount of carbon dioxide released into the atmosphere when they burn fossil fuels, solid waste, and wood for heating the buildings, moving vehicles and generate electricity. At the same time, the number of trees that are able to absorb carbon dioxide increasingly diminish due to the encroachment of forests for timber or taken for the expansion of agricultural land.
Methane
Methane which is a major component of natural gas also include greenhouse gases. He is an effective insulator, able to capture 20 times more heat than carbon dioxide. Methane released during the production and transport of coal, natural gas, and petroleum. Methane is also produced from the decomposition of organic waste in landfills (landfill), can even be issued by certain animals, especially cows, as a by-product of digestion. Since the beginning of the industrial revolution in the mid-1700s, the amount of methane in the atmosphere has increased one and a half times as much.
