Which organization originally created and launched the 'Earth Hour' environmental awareness campaign that asks people to turn off their lights for one hour annually?

The natural world has inspired some of the most powerful marketing campaigns in history, connecting consumers with environmental causes. In 2007, one organization launched what would become a global phenomenon, encouraging people worldwide to turn off non-essential lights for one hour to raise awareness about climate change. This campaign has since evolved into one of the largest voluntary environmental movements, with billions participating across 190 countries. Test your knowledge about this iconic eco-friendly marketing initiative!

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World Wildlife Fund (WWF)
Greenpeace International
The Nature Conservancy
United Nations Environment Programme (UNEP)