Fill in the blanks.

When it is burned to produce electricity, 1_____ emits the most carbon dioxide. This fossil fuel accounted for 2_______ of the electricity generated in the United States and emitted 68 percent of the carbon dioxide produced by generating electricity.
1 coal, petroleum, natural gas

2 1/3 , 4/3, 1/2

1 answer

1. coal
2. 1/3
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