“Upgraders” are used to purify a form of gas described by this prefix to bring it closer to the methane content of natural gas. A 2004 (15[1])DoE report lists 3-HPA and levulinic acid among the top 12 value-added chemicals derived from sources described by this prefix. A type of energy described by this prefix is combined with carbon capture and sequestration in a net zero strategy called (15[1])BECCS. A form of (*) “char” described by this prefix useful for conditioning soil comes from pyrolysis of hemicellulose-rich “mass” (10[1])described by this prefix. This prefix describes a type of diesel sourced from oil seeds, and more (10[1])general “fuels” described by this prefix (10[1])include corn ethanol. For 10 points, give this prefix that describes renewable energy derived from plants and other once-living matter. ■END■