Ключевые слова: 3d, 3d illustration, alternative, background, bioenergy, cable, concept, conceptual, connect, connection, conservation, consumption, cord, eco, ecologic, ecological, ecology, efficiency, efficient, electric, electricity, energy, environment, environmental, equipment, european, grass, green, heart, idea, illustration, interior, natural, nature, outdoors, plug, power, recycling, renewable, resource, save, saving, sustainable, technology, wire,