Plastic pollution has a harmful impact on our environment—it endangers marine and human health and clogs waterways. Plastics don’t disappear; they persist in the ecosystem for centuries. Scientists estimate that over half the world’s sea turtles and nearly every seabird have eaten plastic. Melati and Isabel Wijsen were just school-aged children when they decided to act. Upset by the rising plastic waste swamping their beloved island of Bali, they launched a movement: Bye-Bye Plastic Bags. Inspired by great leaders, like Nelson Mandela and Mahatma Gandhi, despite facing many hurdles, they sisters persisted—until finally, plastic bags were banned across the island. Their story is a beacon of hope for youth-led climate action, showing that big change can start with small, determined voices.