【正确答案】Water Pollution
Water pollution comes from many sources. One major source is waste products piped into nearby lakes or rivers from various factories. Another is oil or other fuels that spill into the ocean from ships carrying the fuels.
Water pollution is harmful. Industrial wastes have already made many rivers lifeless and oil spilling the sea is killing enormous numbers of fish and birds. In addition, polluted water has been reported as a danger to agriculture since it destroys plants. Besides, polluted water is an increasing danger to public health as people drink dirty water.
Water pollution has become a serious problem. What can we do about it? First, we can make great efforts to clean up polluted water. Second, we can insist that water pollution control laws be passed. Third, we can help to prevent water pollution by not throwing trash into rivers and lakes. Thus, we can control or even prevent water pollution.