Ключевые слова: 22, april, background, blue, care, celebration, chalkboard, clean, color, composition, concept, conservation, copy, date, day, earth, eco, ecology, environment, flat, friendly, future, global, green, holiday, idea, international, lay, lifestyle, nature, object, planet, plant, plants, pollution, preservation, prevention, protection, resources, responsibility, save, space, spring, text, top, view, world,