The Girl who silenced the world for 5 minutes

This is one of the best speeches I have ever heard. A perfect mix of writing and delivery.  Severn Suzuki, A Canadian 13 year old speaks at A UN conference on environment and development. 
Severn is the daughter of David Suzuki, and she is now a TV host, speaker, and environmental activist.

Severn Cullis-Suzuki on Wikipedia