Ключевые слова: alarm, bulb, celebrate, celebration, concept, conversation, day, earth, earth hour, eco, ecology, electricity, energy, environment, environmental, event, flower, flowers, global, gold, green, hour, international, light, light bulb, lightbulb, march, meadow, minute, nature, planet, power, protect, protection, recycle, recycling, renewable, retro, save, science, snowdrop, sustainable, switch, ticking, time, timeline, turn off, world, world earth hour,