Land demand for ethanol production

摘要: Abstract Several key indicators of the sustainability biofuels are related to land used produce feedstock. Most agronomic costs and energy use (fertilizers, herbicides, soil preparation, harvesting) more cropped area than feedstock quantity produced; this is also case greenhouse gas (GHG) emissions (CO2 N2O) change (LUC) impacts, both direct (dLUC) indirect (iLUC), socio-economic impacts (land tenure, prices traditional crop displacement), on biodiversity environment (soil, water air). Today, only a little 2% world arable but if their displace fossil fuels increases, as indicated by some low carbon scenarios, demand for production feedstocks could become constraint expansion. It quite apparent that biofuel yields, present future, should be one main characteristics evaluated in initial screening process. This work uses cases corn sugarcane ethanol draw comparisons these meet targets International Energy Agency (IEA) scenarios terms will most important study results concerning GHG emission reduction potential, including LUC iLUC when meeting Renewable Directive (RED) European Union (EU) Fuel Standard (RFS2) USA. Some technology improvements considered integration first second generation technologies same site processing or ethanol. The simulations demands 2030 projected two alternatives seems not give reasons concern global scale, large enough significant local impacts. abatement potential strongly dependent alternative considered.