Greta Thunberg, 16, spoke out against the Keystone XL Pipeline that is expected to pass through western South Dakota and urged activists and politicians to listen to indigenous people when it comes to climate change during her stop in Rapid City Monday. Thunberg also addressed the recent United Nations Climate Action Summit. She spoke alongside Tokata Iron Eyes, a 16-year-old from Pine Ridge who planned the rally and invited Thunberg to speak at the Pine Ridge and Standing Rock reservations. Officials estimated that between 300 and 400 people attended the rally in Rapid City that started at Memorial Park.