Severn Cullis-Suzuki, a 12-year-old girl, delivered an emotional speech at the 1992 UN Earth Summit, urging adults to take responsibility for environmental destruction to protect future generations. She highlighted the urgent issues of climate change, poverty, and the need for action while challenging adults to align their deeds with their words. Her advocacy emphasizes that children are affected by the decisions made today and calls for a united effort to create a sustainable future.