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Biomass

An ethanol production plant with grain storage silos in Minnesota

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Ethanol, biodiesel and renewable diesel: how biofuels differ

Ethanol, biodiesel and renewable diesel are three different products made three different ways. Ethanol comes from fermenting starch or sugar. Biodiesel comes from a chemical swap called transesterification, and renewable diesel comes from a refinery process called hydrotreating that produces a fuel nearly identical to petroleum diesel.
Large indoor storage hall filled with wood pellets at a biomass fuel depot

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Is Biomass Carbon Neutral? It Depends on the Wood

Biomass energy can be carbon neutral, or it can be worse than coal. Which one you get depends mostly on what you're burning and how long you're willing to wait for the atmosphere to break even.