Which advertising technique did WWF's Earth Hour campaign pioneer that has since been widely adopted by other environmental campaigns?

World Wildlife Fund's 'Earth Hour' has become one of the most recognizable environmental brand campaigns globally. This annual event encourages people worldwide to turn off non-essential lights for one hour as a symbol of commitment to the planet. Beyond the immediate energy savings, the campaign has evolved into a powerful storytelling platform for environmental awareness. Test your knowledge about this innovative campaign that blends conservation messaging with global brand recognition.

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Symbolic participation marketing - turning an individual action (switching off lights) into a global movement with visible impact
Celebrity endorsement strategy - paying A-list celebrities to promote environmental causes in their homes
Carbon offset advertising - where campaign emissions are calculated and offset before launch
Digital-only engagement - being the first major environmental campaign to abandon all print materials