Ключевые слова: air, background, breath, breathe, cancer, clean, concept, conceptual, conservation, countryside, day, earth, 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, world heart day,