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natural habitats. They clear trees from forests to build
houses, farms, cities, and roads. One of the most
terrible instances of habitat destructions is the cutting
down of the
tropical
rainforests.
It is estimated that
these rainforests, which cover less than 10 percent of
the Earth, contain almost half of all the world’s plant
and animal species.
Human activity has had a devastating effect on the natural environment.
Each year, an international organization of scientists releases a special “red list”
that
updates the
status
of more than 44,000 animal and plant species. In 2008,
the organization reported that 25 percent of our planet’s 5,487 mammals are on
the
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