GRE寫作Issue部分精品素材分享之環(huán)境類

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NO對健康和環(huán)境的影響

Nitrogen Oxide is another pollutant that has been nicknamed “a jet-age pollutant” because it is only apparent in highly advanced countries. Sources of this are fuel plant, cars, and trucks. At lower concentrations Nitrogen Oxide is a light brown gas. In high concentrations it is a major source of haze and smog. It also combines with other compounds to help form ozone. Nitrogen Oxide causes eye and lung irritation, and lowers the resistance to respiratory illness, such as chest

colds, bronchitis, and influenza. For children and people with asthma, this gas can cause death. Nitrogen Oxide may be the most dangerous of these pollutants because it also makes nitric acid, when combined with water in rain, snow, fog, or mist. This then becomes the harmful acid rain.

工業(yè)廢物對環(huán)境的危害

Most modern technological processes produce unwanted by-products in addition to the desired products, which are known as industrial waste and pollution. While most material waste is reused in the industrial process, many forms are released into the environment, with negative environmental side effects, such as pollution and lack of sustainability. Different social and political systems establish different balances between the value they place on additional goods versus the disvalues of waste products and pollution. Some technologies are designed specifically with the environment in mind, but most are designed first for economic or ergonomic effects. Historically, the value of a clean environment and more efficient productive processes has been the result of an increase in the wealth of society, because once people are able to provide for their basic needs, they are able to focus on less-tangible goods such as clean air and water.

不可見污染物CO對健康的影響

While you may see pollutants such as particulates, other harmful ones are not visible. Amongst the most dangerous to our health are Carbon Monoxide, Nitrogen Oxides, Sulfur Dioxide, and Ozone. If you have ever been in an enclosed parking garage or a tunnel and felt dizzy or light-headed then you have felt the effect of Carbon Monoxide (CO). This odorless, colorless, but poisonous gas is produced by the incomplete burning of fossil fuels, like gasoline or diesel fuel. Carbon Monoxide comes from cars, trucks, gas furnaces and stoves, and some industrial processes. CO is also a toxin in cigarettes. Carbon Monoxide combines with hemoglobin in the red blood cells, so body cells and tissues cannot get the oxygen they need. Carbon Monoxide attacks the immune system, especially affecting anyone with heart disease, anemia, and emphysema and other lung diseases. Even when at low concentrations, CO affects mental function, vision, and alertness.

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