Ключевые слова: air, anatomy, asthma, background, breath, breathe, breathing, cancer, climate, conservation, copd, eco, ecology, energy, environment, environmental, field, forest, graphic, grass, green, health, healthy, human, illustration, isolated, leaf, leaf shape, lung, lungs, nature, organ, organic, outdoors, oxygen, plant, pollution, protection, pulmonary, respiratory, save, system, tobacco, tree, tree branch, tuberculosis, wallpaper,