燃やす
abstract
activated
adsorb
background
bamboo
black
branch
brittle
broken
burnt
carbon
catalyst
charcoal
coal
com
combustion
cooking
dark
dirty
emission
energy
environment
fossil
fuel
hard
hardwood
heap
industry
macro
material
mine
mineral
natural
nature
particles
pieces
porous
power
purification
purifier
quality
resource
stone
surface
texture
textured
trunk
wood
wooden