Felled Trees	Wood Chips
The Wheelabrator Shasta plant is powered by wood chips.	Paper Waste
Sewage Plant	Corn Field
Sugar Cane	A biotechnologist examines a flask of oil made from microalgae.
All above images - Credit: Gretz, Warren; courtesy of DOE/NREL

Wood

• Trees
• Shrubs
• Wood Residue
  Sawdust, bark, etc. from forest clearings and mills

Wastes

• Municipal Solid Waste (MSW)
  Paper, food and yard wastes, platics, wood, and tires
• Livestock Waste
• Process Waste
• Sewage

Crops

• Starch crops
  Corn, wheat, and barley
• Sugar crops
  Cane and beet
• Forage crops
  Grasses, alfalfa, and clover
• Oilseed crops
  soybean, sunflower, safflower

Aquatic Plants

• Algae
• Water weed
• Water hyacinth
• Reed and rushes