Ключевые слова: activity, agriculture, air pollution, background, concept, copy space, dirtied, earth, ecology, ecosystem, environment, environmental, farm, farmer, fertilizer, fresh, gardening, global warming, growing, hand, increase, leaf, man, man planting, nature, new, oxygen, plant, plantation, planted, planting, planting tree yard, preserve, purify the air, reduce global warming, sapling, save, seed, spring, summer, tree, volunteers, water the plants, watering plant, watering pot, working, world environment, young,