Ключевые слова: abominate, bacterium, bad, biology, biomass, care, circle, clean, dirt, dirty, disdain, earth, ecology, engineering, environmental, excremental, excretion, factory, foul, garbage, global, industry, life, midden, nasty, natural, not, plant, plastic, pollute, pollution, processing, protection, purity, recycle, reduce, reflection, refuse, repulsive, responsible, rot, rubbish, save, sedimentation, settling, sewage, smell, trash, treatment, unhygienic, warming, waste, wastewater, wastrel, water,