Ubiquitous and easy to grow, algae has long been a promising biomass-to-fuel candidate in the eyes of researchers. Now algae is a burgeoning sector in biofuels with several high-profile start-ups, including Craig Venter’s Synthetic Genomics, and the interest of big-time investors like Bill Gates and ExxonMobil. Of course, hurdles still exist to make a competitive fuel. Algal biofuels still cost too much to produce—over $8 a gallon (pdf), according to the DOE. Furthermore, most existing strains do not yield oil in the quantities needed to quickly scale up to commercial production of biofuels. Companies also need to worry about contaminating local ecosystems and the amount of water needed to grow cultures in large batches.
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