In general, newspaper recycling is
A) rare because demand in Europe and Asia has fallen.
B) rare but the demand is quite high and steady.
C) common and widespread, but the demand is quite variable.
D) common and widespread, and the demand remains very consistent and high.
C
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In 1970, the U.S. passed the Clean Air Act which limited emissions from stationary (industrial) sources, including coal-burning power plants. Why has this law not been as successful as hoped in reducing air pollution?
A. The older coal-burning and industrial plants were not required to comply with the law. B. Coal-burning plants built after 1970 were not required to comply with the law. C. The U.S. started importing coal from China which produces more emissions. D. Emissions from coal-burning plants in Iceland have offset our reductions.
As a layer of moves vertically and forms a subsidence inversion,
A) the top of the layer descends a greater distance than the bottom of the layer B) the top of the layer descends a smaller distance than the bottom of the layer C) the top of the layer rises a greater distance than the bottom of the layer D) the top of the layer rises a smaller distance than the bottom of the layer
Ozone depletion is caused by ____.
A. chlorofluorocarbons (CFCs) in the troposphere B. chlorofluorocarbons (CFCs) in the stratosphere C. global warming D. the greenhouse effect E. cold air in the polar regions
In developing countries, most sewage is
A. handled via communal septic tanks. B. discharged, untreated, into surface waters. C. subjected to both primary and secondary sewage treatment. D. subjected to primary (physical) but not chemical treatment.