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Stella Bowles is a teenage environmental campaigner; one you probably haven鈥檛 heard about - yet. But she has sparked real change in the Canadian province of Nova Scotia. Her school science project, and a great deal of persistence, led to a 15 million Canadian dollar project to clean up pollution in her local river. Now she is trying to show other teenagers around the world how they too can be guardians of their local waterways.

Teenagers are often dismissed as too young to have an opinion and too inexperienced to make a difference. But throughout history, changes in society have been powered by youthful outrage and determination. Today鈥檚 young adults face a new array of dangers which will stretch out over decades. This is their inheritance, and they have a clear incentive to improve it.

This is the first of a three-part series, in which Sandra Kanthal talks to teenagers around the world who are determined to be a voice for change. They are passionate, articulate and determined. Their experiences may provide inspiration to others who are fighting to make their world a better place.