Regarding the world's population and other human influences on the natural environment, which of the following statements is FALSE?
a. The world's population is now more than 10 billion people and may exceed 25 billion by 2080.
b. By burning fossil fuels, destroying forests, and stripping the land, humans actually have altered natural cycles and animal populations.
c. Our exposure to toxic hazards, such as radiation, pesticides, and industrial chemicals, has led to an elevated risk of physical and mental disease.
d. Some experts believe that we have already exceeded the number of people the earth can sustain indefinitely.
ANSWER: a
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