Multiple Choice
When he was a candidate for president,Barack Obama proposed which of the following as a means of combating climate change?
A) a "cap and trade" system in which the government would give away permits to emit carbon
B) a "cap and trade" system in which the government would auction permits to emit carbon
C) a tax on carbon emissions
D) a government mandate to switch from gasoline-powered vehicles to vehicles powered by natural gas
Correct Answer:

Verified
Correct Answer:
Verified
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