Human and their inventions, such as cars or plastic, have caused most environmental pollution on Earth. Today car emissions (排放物) are a major source of air pollution leading to climate change. In the meanwhile, plastics fill our ocean, creating a significant health issue to marine (海洋的) animals.
And what about the electric light, which is thought to be one of the greatest human inventions of all time? Electric light can be a beautiful thing, guiding us home when the sun goes down, keeping us safe and making our homes bright. However, like CO2 emissions and plastic, too much of a good thing has started to influence the environment. Light pollution, the wrong use of outdoor light, is affecting human health, wildlife behavior and our ability to observe stars.
Light pollution is a global issue. This became obvious when the World Atlas of Artificial Night Sky Brightness, a computer-created map based on thousands of satellite photos, was published in 2016, which can be viewed online. The map shows how and where our globe is lit up at night. Vast areas of North America, Europe, the Middle East and Asia are glowing (发光) with light, while only the most distant regions on Earth (Greenland, Central African Republic and Niue) are in total darkness. Some of the most light-polluted countries in the world are Singapore, Qatar, and Kuwait.
Sky glow is the brightening of the night sky, mostly over cities, due to the electric lights of cars, streetlamps, offices, factories, outdoor advertising, and buildings, turning night into day for people who work and play long after sunset.
People living in cities with high levels of sky glow have a hard time seeing more than a handful of stars at night. Astronomers (宇航员) are particularly concerned with sky glow pollution as it reduces their ability to view stars.
Mostly over 80 percent of the world's population, and 99 percent of Americans and Europeans live under sky glow.
28. What can we learn from paragraph 2?
A.Electric light should be not be used outdoors. | B.Electric light is the main factor to keep us safe. |
C.Electric light has both advantages and disadvantages. | D.Electric light is the greatest human invention. |
29. Which of the following places is least affected by sky glow?
A.Niue. | B.Singapore. | C.Kuwait. | D.Qatar. |
30. What activity in real life may cause light pollution?
A.Keeping the streetlamps on. | B.Littering plastics about. |
C.Driving cars around. | D.Overfishing marine animals. |
31. What's the attitude of astronomers towards light pollution?
A.Uncaring. | B.Unclear. | C.Worried. | D.Satisfied. |