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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