The Turth About Recycling
It is an awful lot of rubbish. Since 1960 the amount of municipal waste being collected in America has nearly tripled, reaching 245 million tonnes in 2005. According to European Union statistics, the amount of municipal waste produced in Western Europe increased by 23% between 1995 and 2003, to reach 577kg per person, (So much for the plan to reduce waste per person to 300kg by 2000.) As the volume of waste has increased, so have recycling efforts. In 1980 America recycled only 9.6% of its municipal rubbish, today the rate stands at 32%. A similar trend can be seen in Europe, where some countries, such as Austria and the Netherlands, now recycle,60% or more of their municipal waste. Britain's recycling rate, at 27%. is low, but it is improving fast, having nearly doubled in the past three years.
Even so, when a city introduces a kerbside recycling programme, the sight of all those recycling lorries trundling around can raise doubts about whether the collection and transportation of waste materials requires more energy than it saves. "We are constantly being asked: Is recycling worth doing on environmental grounds? says Julian Parfitt, principal analyst at Waste & Resources Action Programme (WRAP), a non-profit British company that encourages recycling and develops markets for recycled materials.
Studies that look at the entire life cycle of a particular material cam shed light on this question In a particular case, bat WRAP decided to take a broader look. It asked the Technical University of Denmark and the Danish Topic Centre on Waste to conduct a review of 55 life-cycle analyses, all of which were selected because of their rigorous methodology. The researchers then looked at more than 200 scenarios, comparing the impact of recycling with that of burying or burning particular types of waste material. They found that in 83% of all scenarios that included recycling, it was indeed better for the environment.Based on this study, WRAP calculated that Britain's recycling efforts reduce its carbon-dioxide emtssions by 10-15 million tonnes per year. That is equivalent to a 10% reduction in Britain's annual carbon-dioxide emissions from transport, or roughly equivalent to taking 3.5 million cars off the roads. Similarly. America's Environmental Protection Agency estimates that recycling reduced the country's carbon emissions by 49 mlllion tonnes in 2005.
Recycling has many other benefits, too. It conserves natural resources. It also reduces the amount of waste that is buried or burnt, hardly ideal ways to get rid of the stuff. (Landfills take up valuable space and emit methane, a potent greenhouse gas; and although incinerators are not as polluting as they once were, they still produce noxious emissions, so people dislike having them around.) Butperhaps the most valuable benefit of recycling is the saving in energy and the reduction in greenhouse gases and pollution that result when scrap materials are substituted for virgin feedstock. "If you can use recycled materials, you don't have to mine ores, cut trees and drill for oil as much," says Jefrey Morris of Sound Resource Management, a consulting firm based in Olympia, Washington. Extracting metals from ore, in particular, is extremely energy-intensive. Recycling aluminium, for example, can reduce energy consumption by as much as 95%. Savings for other materials are lower but still substantial: about 70% for plastics, 60% for steel, 40% for paper and 30% for glass. Recycling also reduces emissions of pollutants that can cause smog, acid rain and the contamination of waterways.
The virtue of recycling has been appreciated for centuries. For thousands of years metal items have been recycled by melting and reforming them into new weapons or tools. It is said that the broken pieces of the Colossus of Rhodes, a statue deemed one of the seven wonders of the ancient world, were recycled for scrap.
A.more municipal waste than any other countries.
B.more municipal waste than any other European countries.
C.more than half of their municipal waste.
第1题
对于图书管理数据库,分别求出各个单位当前借阅图书的读者人次。下面的SQL语句正确的是 ______。 SELECT单位,______FROM 借阅,读者WHERE; 借阅.借书证号=读者.借书证号 ______
A.COUNT(借阅.借书证号) GROUP BY 单位
B.SUM(借阅.借书证号) GROUP BY 单位
C.COUNT(借阅.借书证号) ORDER BY 单位
D.COUNT(借阅.借书证号) HAVING 单位
第2题
A.COUNT(借阅.借书证号) GROUP BY 单位
B.SUM(借阅.借书证号) GROUP BY 单位
C.COUNT(借阅.借书证号) ORDER BY 单位
D.COUNT(借阅.借书证号) HAVING 单位
第3题
A.COUNT(借阅.借书证号) GROUPBY单位
B.SUM(借阅.借书证号) GROUPBY单位
C.COUNT(借阅,借书证号)ORDER BY单位
D.COUNT(借阅,借书证号).HAVING单位
第4题
A)SELECT单位,COUNT(借阅.借书证号)FROM借阅,读者WHERE;
借阅.借书证号=读者.借书证号ORDERBY单位
B)SELECT单位,COUNT(借阅.借书证号)FROM借阅,读者WHERE;
借阅.借书证号=读者.借书证号GROUPBY单位
C)SELECT单位,SUM(借阅.借书证号)FROM借阅,读者WHERE; &&
借阅.借书证号=读者.借书证号HAVING单位
D)SELECT单位,SUM(借阅.借书证号)FROM借阅,读者WHERE;
借阅.借书证号=读者.借书证号GROUPBY单位
第5题
设有图书管理数据库: 图书(总编号C(6) ,分类号C(8) ,书名C(16) ,作者C(6) ,出版单位C(20) ,单价N(6,2) ) 读者(借书证号C(4) ,单位C(8) ,姓名C(6) ,性别C(2) ,职称C(6) ,地址C(20) ) 借阅(借书证号C(4) ,总编号C(6) ,借书日期D(8) ) 对于图书管理数据库,分别求出各个单位当前借阅图书的读者人次。下面的SQL语句正确的是 ______。 SELECT单位, FROM借阅,读者WHERE;
A.COUNT(借阅.借书证号)GROUP BY单位
B.SUM(借阅.借书证号)GROUP BY单位
C.COUNT(借阅.借书证号)ORDER BY单位
D.COUNT(借阅.借书证号)HAVING单位
第6题
设有图书管理数据库:
图书(总编号C(6),分类号C(8),书名C(16),作者C(6),出版单位C(20),单价N(6,2))
读者(借书证号C(4),单位C(8),姓名C(6),性别C(2),职称C(6),地址C(20))
借阅(借书证号C(4),总编号C(6),借书日期D(8))
对于图书管理数据库,分别求出各个单位当前借阅图书的读者人次。下面的SQL语句正确的是______。
SELECT 单位,______ FROM 借阅,读者 WHERE;
借阅.借书证号=读者.借书证号 ______
A、COUNT(借阅.借书证号) GROUP BY 单位 B、SUM(借阅.借书证号) GROUP BY 单位
C、COUNT(借阅.借书证号) ORDER BY 单位 D、COUNT(借阅.借书证号) HAVING 单位
第7题
设有图书管理数据库:
图书(总编号C(6),分类号C(8),书名C(16),作者C(6),出版单位C(20),单价N(6,2))
读者(借书证号C(4),单位C(8),姓名C(6),性别C(2),职称C(6),地址C(20))
借阅(借书证号C(4),总编号C(6),借书日期D(8))
对于图书管理数据库,分别求出各个单位当前借阅图书的读者人次。下面的SQL语句正确的是______。
SELECT 单位,______ FROM 借阅,读者 WHERE;
借阅.借书证号=读者.借书证号 ______
A、COUNT(借阅.借书证号) GROUP BY 单位 B、SUM(借阅.借书证号) GROUP BY 单位
C、COUNT(借阅.借书证号) ORDER BY 单位 D、COUNT(借阅.借书证号) HAVING 单位
第8题
对于图书管理数据库,检索所有借阅了图书的读者姓名和所在单位。下面SQL语句正确的是______。 SELECT DISTINCT 姓名,单位 FROM 读者,借阅
A.WHERE 图书.总编号=借阅.总编号
B.WHERE 读者.借书证号=借阅.借书证号*
C.WHERE 总编号 IN(SELECT 借书证号 FROM 借阅)
D.WHERE 总编号 NOT IN(SELECT 借书证号 FROM 借阅)
第9题
A.COUNT(借阅.借书证号) GROUP BY 单位
B.SUM(借阅.借书证号) GROUP BY 单位
C.COUNT(借阅.借书证号) ORDER BY 单位
D.COUNT(借阅.借书证号) HAVING 单位
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