Young voices are especially powerful because adults often pay more attention to kids than to grown ups. If you don’t believe me, check out some articles I wrote about some inspiring kid activists:

Celia Ho - a then-14-year-old student from Hong Kong who launched a campaign to stop ivory consumption.
https://blog.nationalgeographic.org/2013/02/21/a-young-voice-for-elephants-celia-ho/

Nellie Shute (then age 12), Lucy Lan Skrine (11) and Christina Seigrist (9), dubbed the Elephant Angels, are three Hong Kong schoolchildren who are transforming attitudes about elephant ivory through small actions that are having a big impact.
https://news.nationalgeographic.com/news/2014/04/140425-hong-kong-ivory-trafficking-elephants-china-world/

Fifth graders at P.S. 107 John W. Kimball Learning Center in Brooklyn, New York write books about animals to tell their plight, including one about an orphaned orangutan
https://www.huffingtonpost.com/laurel-neme/schoolkids-write-book-abo_b_11199560.html

Taegen Yardley, age 12, takes a stand for elephants in Vermont and around the world.
http://moomah.com/themagazine/taegen-yardley