When the quantity of environmental protection is low so that pollution is extensive, then there are usually ______________ to reduce pollution and the ______________ .
A. a few inexpensive and easy ways; average benefit are slightly higher
B. a lot of expensive and innovative methods; marginal benefits are quite high
C. only a few expensive and innovative methods; average benefits are higher
D. a lot of cheap and easy ways; marginal benefits of doing so are quite high
D. a lot of cheap and easy ways; marginal benefits of doing so are quite high
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Describe the successes and failures of the economic and social development of the Russian Domain after the end of the Soviet era.
What will be an ideal response?
Which of the following practices by farmers decreases erosion?
A) tilling B) planting ground cover crops C) allowing fields to lie empty and fallow D) removing weeds
How many people worldwide live on land that is less than one meter above sea level?
A) 1 billion B) 900 million C) 100 million D) 50 million
The African region has a wealth of inland waterways, but frequent changes in elevation and escarpments make them difficult for transportation. However, they are especially attractive for
a. hydroelectric power. b. large urban areas. c. oil and gas exploration. d. casino and gaming facilities. e. heavy manufacturing.