People and the Environment
Tropical rainforests cover over an area of nearly 3 billion
acres, or about 8.3 percent of the Earth’s total land surface.
These remarkable forests are shared by some 50 countries on five
continents. Biologists believe that rainforests are the home of
perhaps half the world’s biotic species, about five-sixths of which
have not yet been described and named.
Throughout most of history, rainforests were considered to be
remote, inaccessible, unpleasant places, and as a result they were
little affected by human activities. In the present century,
however, rainforests have been exploited and ruined at a quickening
pace, and in the last decade or so, tropical deforestation has
become one of the Earth’s most serious environmental problems. The
rate of deforestation is spectacular — 51 acres per minute; 74,000
acres per day; 27 million acres per year. More than half of the
original African rainforest is now gone; about 45 percent of
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