Ключевые слова: algae, aquatic, cleanliness, concept, conservation, contamination, crisis, dirty, discharge, drain, drainage, drainpipe, dumping, eco, ecofriendly, ecological, environment, environmentalism, filth, global, green, hazardous, health, impact, liquid, nature, ocean, pollution, preservation, purification, river, sewage, sewer, sustainability, toxin, treatment, unhygienic, waste, water,