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The Empire State Building dimmed its lights and the Eiffel Tower went dark as iconic landmarks across the world observed Earth Hour, the global climate change awareness campaign. The usually glittering nighttime majesty of the Empire State Building was set to "faint sparkle" in New York, while theaters on Broadway also toned down the neon. In Paris, the Eiffel Tower went black for only five minutes -- due to security reasons -- while nearly 300 other monuments in the City of Light also switched off their lights. This year's Earth Hour comes as the French capital prepares to host a crucial UN climate conference in December that will bring together the international community to discuss efforts to limit global warming.