Ключевые слова: air, autumn, background, biosphere, botany, cartography, cleanup, concepts, control, damage, design, earth, effect, element, environment, environmental, erosion, green, ideas, international, isolated, leaf, map, mine, nature, object, obsolete, oil, old, olive, organic, planet, plant, pollution, recycling, reforestation, reserves, runoff, season, sewage, single, slick, textured, toxic, waste, water, white, world, worm,