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次の３つの段落からなる英文を読み、（Ａ）〜（Ｃ）の各段落の要旨をそれぞれ60字以内の日本語で書きなさい。
(Ａ) Fossil fuels, such as coal, oil, and gas, are nonrenewable sources of energy. Yet they account for almost 90 percent of our fuel use. In addition, they are pollutants and are dangerous as well. Moreover, the reserves are not endless. Oil, which accounts for 40 percent of the world's energy sources, will run out in 50 years, at current usage rates. Coal, accounting for 30.3 percent, will last another 300 years. Natural gas, which accounts for almost 20 percent of our energy sources, will run out in 50 years, if current usage level do not vary. Thus, oil is one of the most prevalent sources of energy. Yet it is one of the most polluting. Spills from oil tankers often cause widespread ecological damage. A prime example is the Exxon Valdez. In 1989, this ship leaked 11 million gallons of oil off the coast of Alaska. An oil spill covering 2,590 square kilometers was created. In the process, 2 million gallons of oil washed up on the beaches, killing thousands of birds and animals.
(Ｂ) Similarly, coal mining destroys the landscape by making everything in its path ugly. The accompanying destruction of the soil is perhaps even worse. Moreover, it endangers the lives of the mine workers, who often suffer from lung disease. In addition, accidents frequently cause their deaths. The use of natural gas is also dangerous. In a country like Japan with many earthquakes, the probability of gas explosions, during or after a quake, is very real. Moreover, such explosions, and resulting fires, also occur because of simple carelessness. While nuclear fuels are not fossil-based, they are nonetheless controversial and dangerous. In addition, they account for just 3.9 percent of energy resources, and will last only another 60 years, at current rates of usage. A point in their favor, however, is that they do not cause pollution. Yet they can cause death to those exposed to their radioactivity.
(Ｃ) Moreover, nuclear-plant accidents, such as the one at Chernobyl, can be disastrous. In this accident, the plant's generator overheated and released a (注)radioactive cloud, which drifted over most of Europe. Both wildlife and domestic animals were affected. Those close to the plant died. Reindeer in Sweden had to be destroyed because the had eaten grass which had become radioactive. And in other parts of Europe, milk and meat from domestic animals could not be consumed for the same reason. Even when there are no accidents, there is still the problem of nuclear waste. Because its radioactive life is so long, it has to be sealed off and buried for 25,000 years before it becomes harmless. In 1992, nuclear waste from France was transported to Japan by ship for partial use and disposal. Many environmentalists were concerned that the ship would have an accident while in transit. In previous years, people didn't worry so much about pollution and the danger to the planet. Now, however, we have a newfound consciousness of the imperfection of both fossil-based fuels and nuclear power. This knowledge should make us concentrate our attention on renewable sources of energy.
(注)radioactive: 放射能をおびた [小樽商大]
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