In the last half-century humans have converted roughly _______ of forested land to other land use.
A) 70%
B) 50%
C) 30%
D) 10%
Correct Answer:
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Q50: Sea level is currently rising at a
Q51: How much of the energy produced in
Q52: "Black lung" is an occupational hazard for
Q53: Approximately _ of the electrical energy used
Q54: Atmospheric chemist Paul Crutzen proposed that a
Q56: Approximately what was the population doubling time
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Q58: The point at which global oil production
Q59: The world population first doubled approximately _
Q60: The main ingredient of natural gas is
A)nitrous
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