Ключевые слова: abominate, bacterium, biology, biomass, circle, clean, dirt, dirty, disdain, ecology, engineering, environmental, excremental, excretion, factory, foul, garbage, global, industry, nasty, natural, nature, plant, plastic, pollute, pollution, processing, protection, purity, recycle, reduce, reflection, refuse, repulsive, responsible, rubbish, sedimentation, sewage, smell, trash, treatment, unhygienic, warming, waste, wastewater, wastrel, water,