He was a plaintiff in Juliana v. United States, which has been called likely the most ambitious and aggressive climate change lawsuit filed to date.

[3][4][5][6] Barrett traces an early influence to rising watermelon outside his grandparents' home in Honduras.

In 2014, through Global Kids, Barrett took a three-week trip to Bosnia sponsored by and conducted by the U.S. State Department.

Mentors at those two organizations thought Barrett would be a good addition to the landmark lawsuit that Our Children's Trust was putting together, known as Juliana v. United States.

[5] The time commitment, including trips to Washington, D.C. and San Francisco for case related appearances,[19] led him to withdraw from his undergraduate studies in political science at the University of Wisconsin-Madison.