[单项选择]Scientists say there has been a severe decrease in the amount of water in Lake Chad in northern Africa in the last thirty years. They report that nature and humans share equal blame for this loss. In 1963 the fresh water lake covered twenty-five- thousand square kilometers. Now the lake is only about five percent of that size. It measures only about one-thousand-three-hundred square kilometers in the dry season.
Four nations surround Lake Chad. People in Niger, Nigeria, Chad, and Cameroon use it for water, fish and plant life. Michael Coe and Jonathan Foley are water experts at the University of Wisconsin in Madison. They reported about Lake Chad in the Journal of Geophysical Research. They say the area has suffered from a lack of heavy rain for more than thirty years. This has forced people to build systems to carry water to dry land. These irrigation systems further decrease the lake.
Mister Coe says Lake Chad will be only a small body of water in the future. He says pe
A. Lake Chad is located in the middle of Chad in northern Africa.
B. The water from Lake Chad can now only be used for irrigation.
C. The area around Lake Chad has suffered from decreased rainfall for a few decades.
D. Population around Lake Chad now begins to decrease due to lack of water.