绿叶鸟网（www.lvyeniao.cn）原创整理的 > 考研英语作文 In the late 10's, many people in North America turned their attention to environmental problems, and new steel-and-glass skyscrapers were widely criticized. Ecologists pointed out that a cluster of tall buildings in a city often overburdens public transportation and parking lot capacities. Skyscrapers are also lavish consumers, and wasters, of electric power. In one recent year, the addition of 17 million square feet of skyscraper office in New York City raised the peak daily demand for electricity by 120, 000 kilowatts-enough to supply the entire city of Albany, New York, for a day. Glass-walled skyscrapers can be especially wastel. The heat loss (or gain)through a wall of half-inch plate glass is than ten times that through a typical masonry wall filled with insulation board. To lessen the strain on heating and air-conditioning equipment, builders of skyscrapers have begun to use double-glazed panels of glass, and reflective glasses coated with silver or gold ror films that reduce glare as well as heat gain. Howr, ror-walled skyscrapers raise the temperature of the surrounding air and affect neighboring buildings. Skyscrapers put a sre strain on a city's sanitation facilities, too. If lly occupied, the two World Trade Center towers in New York City would alone generate 2.25 million gallons of raw sewage each year-as much as a city the size of Stanford, Connecticut , which has a population of than 109, 000.
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