英语四级备考听力练习:慢速英语
From Learning English, this is the Agriculture Report.
Climate researchers met recently in Cameroon to talk about threats to Africas land and animals. They said they believe the continent may lose as much as 30 percent of its animal and plant species by the end of this century. They blame the expected losses on the warming of earth, population growth and unrestricted development.
The researchers represent 20 African, American and European universities. They say countries south of the Saharan desert are losing forest faster than any place on earth. Wood companies are cutting down trees to meet growing demand from China, Europe and the United States.
The population is growing at 3 percent per year. There are now homes, factories and farms on land that once was forest. Many African animals and plants no longer have a place to live as result. Climate change also continues to threaten species.
Thomas Smith is the director of the Center for Tropical Research at the University of California.
With a 1.5 degree rise in global temperature, Africa may lose 30 percent of its animals and plants. And unfortunately with the increase in CO2 that has been now estimated to be up to three degrees in terms of rising global temperatures -- that means we may lose 40 percent of all mammal species in Africa by the end of the century, said Smith.
The African chimpanzee is one such animal at risk. Mary Katherine Gonder is a professor in the Department of Biology at Drexel University in Philadelphia, Pennsylvania.
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