Energy from Biomass Practice Test

Reduced waste and displacement of some petroleum diesel use, though combustion still emits CO$_2$ and NO$_x$; overall impacts depend on collection and processing energy.

Increased methane emissions because biodiesel production requires anaerobic decomposition of grease in landfills before it can be refined into fuel.

Immediate recovery of all nutrients to cropland because biodiesel processing converts grease into nitrate fertilizer without any byproducts or residues.

Elimination of all transportation emissions because biodiesel engines do not combust fuel; they run on photosynthesis occurring inside the engine cylinder.