agriculture
alternate
alternative
chimneywood
climate
compatible
cuttings
ecologically
effect
energy
energysource
engine
environment
environmental
environmentally
felltrees
fields
firewood
forest
fuel
fuelwood
geschnittem
global
green
greenhouseeffect
heap
heating
log
material
natural
nature
nonpolluting
oil
pileofwood
polluting
pollution
power
raw
renewable
round
source
stock
stovewood
timber
tree
trunk
turbine
warming
wood