Ключевые слова: alternative, biology, car, charge, clean, climate, conservation, earth, eco, ecological, ecology, economy, efficiency, electricity, electronic, energy, environmental, environmental conservation, factory, flower, friendly, globe, growth, horizontal, house, icon set, leaf, outline, panel, pictogram, planet, planet earth, pollution, power, protect, recyclable, recycling, renewable, save, saving, sign, signs, solar, solution, source, sustainability, sustainable, symbol, wind,