As the population of the planet increases, so does the amount of homes, businesses, parking lots, schools, airports and roadways. All these buildings use electricity and need to be lighted. Humans demand these lights. They want their homes more comfortable and they want their streets safe. The problem is that researchers are finding that all this light is having a negative effect on humans and wildlife as well.
Less than 10 years ago I drove to a less populated section of my town, lay down in the middle of the road and watched an attractive meteor shower(流行雨). The area was short of homes, street lights and traffic. If I did that today, I wouldn’t be able to see the meteor shower as well, due to the increase in street lights, and I would surely be run over by a car.
Nowadays scientists are finding light pollution can be almost as bad as carbon dioxide pollution. If you’ve ever taken a flight at night, the view is beautiful, but you must remember that all the light you see is wasted electricity.
One of the saddest parts of light pollution is that most of it is unnecessary and most of the outdoor light that we use is wasted. One only needs to look at a row of street lights to see how much of the light shines upwards and lights the sky; a total waste of electricity.
Additionally, somewhere this electricity needs to be generated, and the generation of that electricity creates pollution by giving off greenhouse gases. This affects the air we breathe and our quality of life.
Scientists are also studying the effects of light pollution on wildlife. Thousands of birds die each year when they crash into highly lit buildings, as they become disoriented(分不清方向) by the light. It has been long known that tiny sea turtle hatchlings（刚孵化的小海龟）become disorientated and follow lights on the shore instead of heading towards the sea.
Fortunately, light pollution is one of the sources of pollution that can be most easily corrected without a negative effect. Following some guidelines and a little searching on Google can give you many ideas on how to reduce your contribution to light pollution.
29.For what purpose is Paragraph 2 written?
A.To describe the past beauty of the town. B.To show the advantages of a small population.
C.To study the changes of the town. D.To prove the negative effect of light pollution.
30.Which of the following is the effect of light pollution?
A.The air we breathe may be polluted. B.It is much easier for us to watch meteor showers.
C.Many animal species have died out. D.More traffic accidents happen every day.
31.What can be inferred from the text?
A.We are almost at a loss how to deal with light pollution.
B.Some animals use natural light to direct themselves.
C.Global warming results in light pollution in some ways.
D.Astronauts can seldom see clearly in space nowadays.
32.What will the writer discuss after the last paragraph?
A.Websites on light pollution. B.Sources of light pollution.
\ C.Ways of reducing light pollution. D.More bad effects of light pollution.