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上帝之眼 Yann Arthus Bertrand 扬恩 亚瑟空中摄影奇景壁纸北美篇 鸟瞰美国 洛杉矶高速公路互通立交图片壁纸

上帝之眼 Yann Arthus Bertrand 扬恩 亚瑟空中摄影奇景壁纸北美篇 鸟瞰美国 洛杉矶高速公路互通立交图片壁纸壁纸 扬恩·亚瑟空中摄影奇景 北美篇壁纸 扬恩·亚瑟空中摄影奇景 北美篇图片 扬恩·亚瑟空中摄影奇景 北美篇素材 风景壁纸 风景图库 风景图片素材桌面壁纸鸟瞰美国:洛杉矶高速公路互通立交,LosAngeles, in Southern California, is the second-largest city in theUnited States in population and area. Los Angeles is a shipping,industrial, communication, and financial center for the westernUnited States and much of the Pacific Basin, and themotion-picture capital of the nation, if not the world. The LosAngeles metropolitan area encompasses 34,000 square miles (88,000km2) and is connected by a freeway system, which is increasinglyunable to accommodate the growing traffic. The tremendous numberof vehicles, coupled with the geographic position of the city,creates unhealthily high levels of smog. A light-rail system andbus transporation do little to alleviate the highway congestion.One-quarter of the energy produced globally is absorbed by thetransport sector. Transportation accounts for half of worldpetroleum consumption, which has expanded sevenfold in fiftyyears. This sector is responsible for nearly a fourth of carbondioxide emissions and is thus among the chief sources ofgreenhouse gas emissions, which lead in turn to global warming. Itis possible, however, that the petroleum era may be coming to aclose, succeeded by the age of hydrogen, a clean fuel extractedfrom water, which can be used in engines equipped with afuel-driven battery.
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