How are greenhouse gases produced?

Greenhouse gas refers to any gas existing in the atmosphere that absorbs and releases infrared radiation. The six greenhouse gases stipulated in Kyoto Protocol are: carbon dioxide (CO? ), methane (CH? ), nitrous oxide (n? O), hydrofluorocarbons, perfluorocarbons and sulfur hexafluoride (SF6).

The main reason for the increase of carbon dioxide concentration in the atmosphere is the large-scale exploitation and use of fossil fuels after industrialization. Since 1860, the average annual growth rate of carbon dioxide emissions from burning fossil fuels has been 4.22%, and the total emissions of various fuels have reached about 5 billion tons every year in the past 30 years.

Another main reason for the increase of carbon dioxide in the atmosphere is cutting down trees as fuel. Forests used to be a "reservoir" of atmospheric carbon cycle, and each square meter of forests can assimilate 1-2 kg of carbon dioxide. Deforestation has turned the original "reservoir" of carbon dioxide into another "source" of carbon dioxide discharged into the atmosphere.

Methane is produced by methane-producing bacteria or organisms rotting in an anoxic environment. Every year, the swamp will produce 65438+350 TG (1t =10/2), the paddy field will produce 100Tg, and the digestive system of cattle and sheep will produce 100-6544 during fermentation.

Extended data:

Harm of greenhouse effect.

1. Rising temperatures will lead to melting glaciers, rising sea levels and inundation of coastal cities.

The water on the surface of the earth evaporated, which turned the land into a desert and reduced the agricultural output.

Prevention and control measures of greenhouse effect.

1. Reduce the use of carbonaceous fossil fuels such as coal and oil, and make more use of clean energy such as solar energy, wind energy, hydro energy, geothermal energy and tidal energy.

2, vigorously afforestation, prohibit deforestation, advocate planting grass and flowers, increase the green area.

Baidu encyclopedia-greenhouse gases