Fuel-Cycle Energy and Emissions Impacts of Fuel Ethanol
Total energy cycle includes fuel cycle and vehicle cycle
The Greenhouse gases, Regulated Emissions, and Energy use in Transportation (GREET) model
Key parameters that determine fuel-cycle energy use and GHG emissions of corn ethanol
Historical corn production per pound of fertilizer used (3-yr moving average, based on USDA data)
Technology is improving energy use intensity of ethanol plants
Up-stream energy and emissions allocated to co-products varies by allocation method
Key parameters that determine fuel-cycle energy use and GHG emissions of cellulosic ethanol
Base values of key parameters for biomass farming: per dry ton of biomass
Parametric assumptions for current, near-future, and future cases
Ethanol energy balance: Btu in a gal of ethanol minus Btu required to produce it
Effects of ethanol blends: per-mile petroleum use changes (% relative to gasoline)
Effects of ethanol blends: per-mile fossil energy changes (% relative to gasoline)
Effects of ethanol blends: per-mile greenhouse gas emissions changes (% relative to gasoline)
Per-gallon ethanol effects: greenhouse gas emissions changes (% relative to gasoline)
Per-mile changes in greenhouse gas emissions: near-term cars (relative to Tier 1 GVs)
Per-mile changes in greenhouse gas emissions: long-term cars (relative to Tier 2 GVs)