The Wijsen sisters created the youth-driven initiative, Bye Bye Plastic Bags

“Don’t ever let anyone tell you that you’re too young or you won’t understand,” Isabel told the audience. “We’re not telling you it’s going to be easy. We’re telling you it’s going to be worth it.”

“In Bali, we generate 680 cubic meters of plastic garbage a day,” said Isabel. “That’s about a 14-story building. And when it comes to plastic bags, less than 5 percent get recycled.”

The two sisters have succeeded in convincing Bali Governor Pastika to commit to a plastic bag-free Bali by 2018.

Watch their TED talk.