Ключевые слова: arrow, audit, building, business, businessman, certificate, charge, chart, classification, concept, concepts, conservation, consumption, cost, diagram, eco, ecology, economic, economy, efficiency, efficient, electric, electricity, energy, energy efficiency, engineer, environment, environmental, finance, global, graph, green, home, house, ideas, improvement, label, light bulb, people, performance, power, rate, rating, recycling, renovation, save, saving, scale, technology, zero,