Ключевые слова: alternative energy, atom, ball, blue, business, care, conceptual, conservation, continent, cover, crystal, development, earth, ecology, electricity, electron, energy, environmental, finger, fossil, fuel, future, glass, global, globe, glow, green, growth, hand, hold, human, ideas, land, map, nature, nuclear, palm, peace, planet, power, protect, responsibility, save, sphere, spirit, static, super, usa, world, world map,