background
biomass
block
brick
briquet
briquette
brown
chip
close
combustible
compressed
cut
dry
dust
ecology
energy
filings
fire
firewood
fragments
fuel
granulated
granules
heat
isolated
lumber
macro
material
natural
pile
power
pressed
renewable
resource
saw
sawdust
splinter
stack
texture
timber
tree
warm
waste
white
winter
wood
wooden