The present invention provides a method for reducing life cycle GHG emissions associated with production of a liquid fuel or fuel intermediate. The method comprises: fermenting sugar to produce biogenic carbon dioxide and the liquid fuel or fuel intermediate; collecting an amount of biogenic carbon dioxide generated from the fermentation; and supplying the biogenic carbon dioxide for use in one or more enhanced oil or gas recovery sites for displacement of geologic carbon dioxide. Further provided is a method comprising receiving an amount of carbon dioxide from an apparatus for delivering carbon dioxide to one or more enhanced oil or gas recovery sites so as to displace the use of geologic carbon dioxide at the site. The carbon dioxide received has the GHG emission attributes of the biogenic carbon dioxide introduced to the apparatus.
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