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溫室效應氣體

大氣中促成溫室效應的氣體成分。自然溫室氣體包括二氧化碳大約佔26%,其他還有臭氧、甲烷、一氧化亞氮、以及人造溫室氣體氫氟碳化物等。

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ARCHIV - Neuwagen des Typs Ford-Fiesta und Fusion, die in Köln produziert wurden, werden am 10.09.2009 auf einem Binnenschiff über den Rhein in Düsseldorf gefahren. Foto: Oliver Berg/dpa (zu dpa Vorausmeldung «Frühjahrsprojektion 2013 der Bundesregierung zum Wirtschaftswachstum» vom 25.04.2013) +++(c) dpa - Bildfunk+++
Pedestrians wearing masks walk on a road in heavy smog in Harbin city, northeast Chinas Heilongjiang province, 23 November 2013. Municipalities and provinces of east and north China started seeing a new round of smog on Friday after days with no wind. The National Meteorological Center issued a yellow warning on haze at 2pm on Friday (22 November 2013), forecasting medium or serious haze in Beijing, Tianjin, and the provinces of Hebei, Shanxi, Shaanxi, Henan, Shandong, Anhui, Jiangsu and Zhejiang. In east Chinas Zhejiang province, smog lingering from late Thursday left the air quality in the cities of Hangzhou, Huzhou, Jiaxing and Shaoxing at seriously polluted levels, according to the website of provincial environment protection department. According to the provincial weather station, the smog will not disperse until late Saturday, when a cold front with rain is expected to hit the province.
A photo shows Tokyo Skytree (right) and Shinjyuku area (background) blanketed with yellow smog in the afternoon on Mar. 10, 2013. According to the Meterological Agency, thick hazy of smoke, caused by the cold weather front, enveloped the city of Tokyo and temperatures reached to around 28 C degrees, the earliest " summer day,'' since 1876. ( The Yomiuri Shimbun via AP Images )
Steam rises from the US Capitol coal-fired power plant, which powers government offices in Washington, DC, USA on 08 December 2009. The US Environmental Protection Agency (EPA) issued a landmark ruling Monday that greenhouse-gas emissions blamed for global warming represent a danger to public health and can be regulated under existing US laws. EPA/MATTHEW CAVANAUGH
In this Friday, Feb. 8, 2013 photo, a US Airways plane taxis past the flight tower at Sky Harbor International Airport in Phoenix. (AP Photo/Ross D. Franklin)