Ключевые слова: 3d, 3d rendering, arrow, bar, blue, building, businessman, certificate, chart, class, classification, concept, conservation, consumption, cost, diagram, ecology, economic, economy, effective, efficiency, efficient, electric, electricity, energy, environment, environmental, finger, graph, green, hand, holding, home, house, icon, improvement, label, level, performance, power, rating, red, save, saving, sign, symbol, technology, touching, using,