The weakness of green fuels is that ____.
they require a lot more work to produce
they must be transported greater distances
burning them releases fossil fuels
they are not as abundant as conventional fuel
Detailed Explanation
Many green fuels require more work to produce than conventional fuels. The passage states “producing natural gas is a much more labor-intensive process than producing an equal amount of conventional gasoline. Producing natural gas also involves burning fossil fuels.”
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