Ключевые слова: action, awareness, black, blackout, business, campaign, candle, candles, city, concept, dark, earth, earthhour, electric, electricity, environment, environmental, event, families, flash mob, global, globe, green, hour, international, landmark, lantern, life, light, man, march, modern, nature, night, off, people, peterburg, power, problem, russia, russian, saint petersburg, save, space, st, student, travel, view, world, youth,