Ключевые слова: air, background, breath, breathe, cancer, clean, concept, conceptual, conservation, countryside, day, earth, earth day, eco, ecology, environment, environment day, environmental, field, forest, grass, green, green heart, health, healthy, heart, human, isolated, landscape, leaf, lung, lungs, natural, nature, organ, oxygen, plant, pollution, protection, restoration, save, save the world, shape, shaped, solution, symbol, tobacco, tree, white, world,