All young people have the ability to become leaders
Sisters Melati and Isable Wijsen share the key lessons they have learnt during their ambitious three-year campaign to stop plastic bags from suffocating their stunning home island of Bali.
Lesson one: "You cannot do it all by yourself"
Lesson two: "Think outside the box"
Lesson three: "Persistence"
"It's not always easy, sometimes it gets a little difficult to walk your talk."