“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 DoE report lists (-5[1])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 BECCS. A form of (*) “char” described by this prefix useful for conditioning soil comes from (10[1])pyrolysis of hemicellulose-rich “mass” described by this prefix. (10[1])This prefix describes a type of diesel sourced from oil seeds, and (10[1])more general “fuels” (10[1])described by this prefix include corn ethanol. For 10 points, give this prefix that describes renewable energy derived from plants and other once-living matter. ■END■