Ключевые слова: air, background, biology, botany, carbon, circle, city, co2, creative, cycle, design, eco, ecology, education, energy, environment, gas, graphic, graphics, green, growth, leaf, leaves, life, light, macro, metro, modern, natural, nature, o2, outdoors, overlay, oxygen, ozone, photosynthesis, plant, power, process, purify, recycle, saving, science, sun, sunlight, system, tech, tree, urban,