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original The Earth is warmed by energy from the Sun, and the heat is eradiated from the warmed Earth. A part of the heat is absorbed by greenhouse gases such as CO2 in the atmosphere, and returned to the land surface again. This is called reradiation. Average air temperature is kept at 15 degree with the reradiation, making it possible for living organism including human to live. In the nature of things greenhouse gases are indispensable. However, if greenhouse gases increase, the Earth gets warmer and warmer.Various impacts are seen by the global warming.Average sea level: Average sea level rose 10-20cm during the 20th century.Glaciers: Many glaciers on the Earth considerably retreated in the last half of the 20th century. 20th century is a turning point that glaciers started to retreat globally. Especially for the past two decades ice sheets have increasingly melt. According to NASA's satellite investigation glaciers at the Andes, Himalaya, Alpine and Pyrenees are significantly shrank over the past decade. Some reports say that a large extent of all glaciers may disappear.
corrected The Earth is warmed by energy from the Sun, and the heat is also reradiated from the warmed Earth. A part of the heat is absorbed by greenhouse gases such as CO2 in the atmosphere, and returned to the land surface again. This is called reradiation. Thanks to it average temperature of the Earth is kept at 15 degrees, making it possible for living organism including human being to live. In nature greenhouse gases are indispensable. However, if greenhouse gases increase, the Earth gets warmer and warmer.Various impacts are seen by the global warming.Average sea level: Average sea level rose 10-20cm during the 20th century.Glaciers: Many glaciers on the Earth considerably retreated in the last half of the 20th century. 20th century is a turning point that glaciers started to retreat globally. Especially for the past two decades ice sheets have increasingly melt. According to NASA's satellite investigation glaciers at the Andes, Himalaya, Alpine and Pyrenees are significantly shrank over the past decade. Some reports say that a large extent of all of the glaciers may disappear.