Question: What does the words "of those" refer to in this context? (It sounds like comparison, but there is no comparison)\n\n---------------------------\nThe net GHG emissions of corn ethanol production, in terms of grams of carbon per MJ, range in these studies from -35 to +29 of those of gasoline.

Answer: Its refering to the the figures of gassoline....as in the sentence there seems to be a comparison being done....
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