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Despite the hype, biofuel itself isn't always the holy grail of sustainability, so there's a little bit more to consider. As Professor Peter Scales from the University of Melbourne warns, not all biofuels are created equal.Scientists break biofuel down into two categories, "generation one" and "generation two." Both are made with ethanol, just like Brewtroleum, but it's the source of that ethanol that makes all the difference.Generation two biofuels source ethanol from waste products—like DB Export's slurry—and materials that would otherwise be thrown away. On the other hand, generation one biofuel is made from crops grown specifically to make ethanol. As Peter explains, this creates a catch-22. "Generation one biofuel is sustainable in one way, in that it's coming from a bio-source not a crude oil, but it is taking up farming land." When countries rely too heavily on generation one biofuels, practices like deforestation become more frequent.Put simply, biofuel is sustainable as long as it's made using stuff that would otherwise go to waste. Because the process of making you a nice cold brew creates so much potential waste, beer isn't just a novel ethanol source for biofuel, it's also a smart one. Cheers to that.Follow Isabelle on Twitter.Trending on Munchies: Global Warming Is Making Our Food Taste Terrible