Ключевые слова: animal, background, chemical, concept, contaminate, contaminated, danger, dangerous, day, dead, deadly, death, decay, disaster, doom, eco, ecological, ecology, ecosystem, environmental, fauna, fish, fishes, harmful, issue, lake, nature, object, outdoors, poison, poisoned, pollute, polluted, pollution, pond, problem, river, rot, rotten, save, smell, stink, stones, toxic, tragic, unclean, waste, water, wildlife,