Wood pellets in the background. Biofuels. Cat litter. Man's hands.
Schlüsselwörter
pellet,
wood,
pellet,
bio-fuel,
bio,
bio-fuel,
biology,
burn,
central,
chips,
conservation,
domestic,
eco,
ecological,
energy,
environment,
environmentally,
fire,
firewood,
flaming,
flowing,
fossil,
fuel,
generation,
granule,
heap,
heat,
household,
industry,
natural,
power,
recycling,
renewable,
sawdust,
solid,
source,
stove,
timber,
waste,
woodpile,
boiler,
friendly,
massa,
phenomena,
pine,
temperature,
unit
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