Ключевые слова: alternative, battery, black, car, charging, chemical, clean, color, concept, eco, ecology, ecosystem, electric, energy, environment, environmental, exhaust, factory, flat, fuel, health, icons, industry, innovation, isolated, leaf, light, line, natural, nature, oil, outline, petroleum, plant, pollution, power, recycle, resources, save, set, sheep, solar, supply, sustainable, thin, wagon, water, wheat, wool,