Leah Thomas, also known as Green Girl Leah, is an American environmental activist. Her focuses on the application of intersectionality to environmental justice. She has been recognized in the 2024 Forbes 30 Under 30 list of notable young professionals. She currently runs Intersectional Environmentalist, a website targeted towards people interested in the relationship between the environment and social justice, and is the author of The Intersectional Environmentalist: How to Dismantle Systems of Oppression to Protect People + Planet.@greengirlleah