By 2050, what proportion of the world's population is expected to live in urban areas?

A. one-fourth
B. one-third
C. one-half
D. two-thirds
E. nine-tenths


Answer: D

Environmental & Atmospheric Sciences

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In La Conchita, California, landslides have been precipitated by ____

A)periods of heavy rainfall B)earthquakes C)deforestation D)dam failures E)fracking

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Indicate whether the statement is true or false

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If the rate at which we produce CO2 were to stop rising, the levels of CO2 in the atmosphere would

A. This cannot be reasonably predicted. B. decrease as CO2 is absorbed by plants, soils, and the oceans. C. eventually level off. D. continue to rise.

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