Air pollution comes from many different sources --not all of them are man-made.For example,dust storms in deserts and the smoke from forest fires are natural sources of air pollution.In urban areas,dirty air is more noticeable because of the fumes from traffic and the waste from factories....
二、完形填空Pollution means contaminating (弄脏) the Earth's environment with materials that harm1 health and lower their quality of life. Pollution can also harm animals and plants. 2many different forms of pollution. The three major groups are air pollution, land pollution and water pollution....
Nowadays, the most serious pollution threat doesn’t come from any particular source, like a factory or sewage treatment plant, but originates from many sources over a large area.And this non-point source pollution is a challenge to deal with, because it doesn’t just enter the bay through...
Below: Nonpoint-source pollution comes from many sources. All the industrial plants alongside a river and the ships that service them may be polluting the river collectively. Photos courtesy of US Fish & Wildlife Service Photo Library, with originals here and here....
The good news is that light pollution, unlike many other forms of pollution, is reversible( 可逆的 )and each one of us can make a difference! Now, many people are taking action to reduce light pollution and bring back the natural night sky. Individuals are urged to use outdoor lighting ...
2 many different fo rms of pollution . T he three major groups are air po llution, land pollution and water pollution .Air pollution comes from different sources - not3 of them are man-made . For erample, dus t storms in deserts and the smoke from forest fires are natural sources of...
Similarly, the gasoline additive, methyl tertiary butyl ether (MTBE), is a serious problem in many states. In California, it is a particularly widespread problem. The California Department of Health Services reported in August 2001 that the following sources of drinking water are polluted with ...
Consequently, there is an ongoing need for research that will guide air quality management strategies by identifying the particles and sources that pose risk to human health. This issue of the journal includes papers from a conference held in 2010 by the American Associatio ......
3 If pollution comes from a s ingle location, such as a pipe attached to a fa ctory, it is known as point source pollution.4 A great deal of water pollution happens not from one single source but from many different sources. T his is called non po int source pollution.Sometimes ...
Governments have passed laws to keep people from releasing dangerous chemicals into the environment. 5 Instead they are getting power from the sun, wind, water, and energy sources that produce less pollution. Many communities use recycling to reduce pollution....