“You have to take the initiative for yourself — not wait for someone else to come up and ask if you want to do something.” 15-year-old Sasha Youn never needed textbooks or teachers to sense the high stakes of climate change. “Ever since she was a little kid, Sasha always loved the ocean and the waterways – the whole ecosystem. We would walk Ocean or Stinson Beach, and she always had such a heart for the animals there.” Juliana Park couldn’t be prouder of her daughter, but she admits: Sasha’s passion for the outdoors came as quite the surprise. “I …