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At the present rate of use, the world's recoverable coal reserves may last about _______ years, and the world's proved petroleum reserves may last about _______ years.

A. 40/100
B. 100/40
C. 100/200
D. 200/40

Answer :

Final answer:

At the present rate of use, the world's recoverable coal reserves may last about 40/100 years, and the world's proved petroleum reserves may last about 40/100 years.

Explanation:

The world's coal and petroleum reserves are critical factors in energy resource planning. "Recoverable coal reserves" typically refer to the coal that can be extracted with current mining technology, while "proved petroleum reserves" are the estimated quantities of petroleum that can be extracted with existing technology and under current economic conditions.

The ratio provided in option (a) suggests that coal reserves may last about 40 years, and petroleum reserves about 100 years, at the present rate of use. These estimates, however, depend on a variety of factors, including changes in technology, economic conditions, and consumption rates.

Therefore, they are subject to change and should be regularly updated as part of global energy resource assessments. Options (b), (c), and (d) do not accurately reflect the current state of these reserves.

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