Ключевые слова: 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,