Despite their positioning as a green alternative, experts warn biofuels expansion could have catastrophic consequences.

First the plant stalk is harvested, shredded, and crushed. The extracted juice is then combined with bacteria and yeast in large bioreactors, where the sugars are metabolized and converted into ethanol and carbon dioxide. From there, the liquid is typically distilled to maximize ethanol concentration, before it is blended with gasoline. You know the final products as biofuels — mostly made…

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