Sisters Melati and Isabel Wijsen are on a mission to ban plastic bags in Bali.

Why you should listen

Inspired by similar measures in other parts of the world, Melati and Isabel Wijsen launched the campaign Bye Bye Plastic Bags in 2013, which received worldwide support -- and recently succeeded in getting the island’s governor to commit to a ban by 2018. The two sisters, who frequent the environmentally minded Green School along with a crew of likely motivated kids, continue to ask the question: How can they make a difference in the world?

Melati and Isabel Wijsen’s TED talk