background
bioenergy
biogenic
biogenic fuel
brown
co2neutral combustion
copy space
crosssection
cut
dry
drying
ecological
ecology
firewood
forest
format filling
fuel
fuelwood
full frame
grain
heat
horizontal format
landscape format
natural
naturally
negative space
pattern
raw material
renewable
renewable raw material
renewable resource
stack
stacked
symbol image
texture
timber
tree trunk
tree trunks
trunk
trunks
wood