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rubber rumen ruminants rural development Rural Energy for America Program (REAP) Rural Energy Self-Sufficiency Initiative Rural Renewable Energy Pilot Program rushes Russia Russian olive rutabaga Rwanda ry rye Rye grass rye straw s saccharification SAF pipeline SAF10 SAF30 SAF40 Safer and Affordable Fuel Efficient Vehicles (SAFE) safety safflower sago pond weed SAIC SAK sal tree Salicornia salt water salt-tolerant saltbush saltcedar Sanctions Santa Monica sardine oil Saskatchewan Saudi Arabia sawdust scale up Scandinavia scholarships/fellowships Science Advisory Board (SAB) Science Policy scooters Scotland scum sea level rise seaports seashore mallow seawater seaweed cultivation Seaweed/Macroalgae second-generation biofuel income tax credit Section 526 Securities and Exchange Commission (SEC) seed husks seed-to-wheel Senegal Serbia sesame sewage Seychelles shale shale gas shale oil shark oil sheep shellfish shipping shipping containers shipworm Sierra Leone silage silica Silphie/cup 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Stakeholders standards start-up State Department Statistics steam explosion steam methane reformation steam reformation steel stevia stillage storage tanks Straight (pure) Vegetable Oil (SVO or PVO) stranded assets Strategic Bioenergy Reserve STrategiv Petroleum Reserve straw students su sub-Saharan Africa sub-sim (substantially similar) succinic acid sucrose Sudan sugar Sugar Beets/Energy Beets Sugar kelp sugar palm sugar platform sugar prices sugar standards sugar-to-biodiesel sugar-to-farnesane sugar-to-jetfuel sugarcane sugarcane prices sugarcane straw sugars sugars-to-fats sulfur Sumatra sunflower sunflower stalks supercritical fluid supercritical hydrolysis supply agreements supply chain Supreme Court surahart Surface Transportation Board Suriname Sustainability Swaziland Sweden sweet potatoes Sweet sorghum sweetgum swine waste Switchgrass Switzerland sycamore syngas (synthesis gas) syngas/gas fermentation SYNHH synthesised aromatic kerosene (SAK) synthetic biology synthetic 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trade dispute/discrimination trade group trade organization Trade Policy trade secrets training trains transesterification transgenics transition Transportation Fuels Policy Transportation Fuels Policy--Municipal Transportation Fuels Policy--State Transportation Policy travel policy Treasury Department trees Trinidad and Tobago triticale trucks tubers tugboats tung tunicate Tunisia Tunsia Turkey U.S. Trade Representative (USTR) UCOME (Used Cooking Oil Methyl Ester) Uganda UK (United Kingdom) UK Emission Trade Scheme (UK ETS) Ukraine Ukriane UL (Underwriters Laboratory) ULSD (ultra low sulfur diesel) Ultra Low Sulfur Fuel Oil (ULSFO) underground storage tanks (UST) UNESCO UNIDO (United National Industrial Development Organization) United Arab Emirates (UAE) United Nations (UN) United Nations' International Civil Aviation Organization (ICAO) United Nations' Sustainable Development Goals (SDG) United States Auto Club Unleaded 88/E15 uranium urban sprawl urbanization Uruguay US Agency for 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