alternative

ardent

background

bark

biofuel

biological

biomass

boiler

burn

central

chips

conservation

deforestation

domestic

eco

ecological

ecology

energy

environment

fire

firewood

friendly

grain

green

heap

hot

house

household

industry

mass

material

natural

nature

pine

plate

renewable

saw

sawdust

sawmill

source

stove

straw

temperature

timber

view

warm

waste

winter

wood

wooden