In the late 1960s, 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 space 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 wasteful. The heat loss through a wall of half-inch plate glass is more 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 mirror films that reduce glare as well as heat gain. However, mirror-walled skyscrapers raise the temperature of the surrounding air and affect neighboring buildings.
Skyscrapers put a severe strain on a citys sanitation facilities, too. If fully 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 more than 109, 000.
Teachers Love 教师的爱
国内英语资讯:Top legislature launches enforcement inspection on SME promoting law
体坛英语资讯:Argentina beat Morocco 1-0 in friendly
国际英语资讯:Nigerian movie industry expects foreign investments
体坛英语资讯:Matthews wins slow motion sprint in stage 2 of Tour of Catalonia
To Spend the “Golden Week” On The Road 在路上度过黄金周
体坛英语资讯:PSC denies underfunding claim by Olympic silver medalist Hidilyn Diaz
国际英语资讯:More Brexit talks between political foes as rage, anger continues at Westminster
体坛英语资讯:Chelsea see off PSG, move into Womens Champions League semifinals
世界自闭症关注日:一起来关注“来自星星的孩子”
国际英语资讯:WTO chief stresses urgency of easing trade tensions to improve global economy
国内英语资讯:Xi calls for closer cultural exchanges between China, Pacific island countries
体坛英语资讯:Morata scores double as Spain win 2-0 in Malta
Dose Mistress Deserves Privacy? 情妇享有隐私权么?
美国参议员支持停止向土耳其交付F-35战机
国际英语资讯:British PM, opposition leader to continue talks on Brexit deadlock
特朗普签署总统备忘录打击网络售假
The Influence of US TV Series 美剧带来的影响
国际英语资讯:Japan lodges protest with Russia over military drills near disputed island
国际英语资讯:British PM offers to talk with opposition leader on Brexit deadlock
是否要关美墨边界?特朗普发出含混信号
Airbnb被爆房东偷拍房客
国际英语资讯:S. Koreas military says UN Command positive about DMZ peace trails
体坛英语资讯:(Sport Focus) New faces, new system: Bayern seeking independence from Lewandowski
国内英语资讯:Spotlight: Inclusion of Chinas bonds in global index to promote its financial integration
国际英语资讯:UN Security Council reaffirms commitment to non-proliferation goals
国内英语资讯:China to further pilot medicine procurement program
体坛英语资讯:British cyclist Yates wins third stage of Volta de Catalonya
国内英语资讯:Xi urges civil affairs authorities to better fulfill duties
国家远程医疗自闭症注册登记平台今日向社会开放
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |