Ключевые слова: alternative, background, bio, biofuels, clean, cloud, concept, conceptual, conservation, design, earth, eco, ecofriendly, ecological, ecology, energy, environment, environmental, global, graphic, green, grow, growth, idea, illustration, isolated, leaf, life, metaphor, natural, nature, organic, planet, pollution, power, protect, recycle, recycling, shape, sign, symbol, text, tree, vegetation, white, word, world,