Good question, zackerybarton22. There has been some research done by the University of Virginia that to suggest that algae biofuel is not really that clean(link). This is because of the large amounts of fertilizer that is used to grow the algae. The fertilizer has petroleum bases and emits large amounts of nitrous oxide, a greenhouse gas that offsets the benefits of the carbon sequestration of the algae. This doesn’t mean algae biofuel can’t become more efficient. The study proposed that perhaps the use of sewage as fertilizer would help solve the problem.
Hope this helps!
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