Xiuhtezcatl Martinez: The Six-Year-Old Who Sued Colorado
Before he was a teenager, Xiuhtezcatl Martinez had already persuaded a Colorado city council to ban pesticides in its parks. By fifteen, he was addressing the United Nations General Assembly in three languages, telling delegates: "What's at stake right now is the existence of my generation." By his mid-twenties he was a recording artist, an author, and a named plaintiff in two of the most closely watched youth climate lawsuits in American legal history.
Raised Between Two Countries and Two Traditions
Martinez was born on 9 May 2000 in Colorado, moved to Mexico in infancy, and returned to grow up in Boulder, Colorado, where his family lived through 2019 before relocating to Portland, Oregon. His mother, Tamara Roske, co-founded the Earth Guardian Community Resource Center and later served as executive director of Earth Guardians until May 2021. His father, Siri Martinez, raised him with a grounding in Mexica traditions and Indigenous heritage that would later shape his environmental philosophy — the belief that environmental destruction represents, in his words, "the tearing apart of a fragile and revered system." He has two younger siblings, Tonantzin and Itzcuauhtli, and was raised vegetarian before becoming vegan.
Twenty questions, eight minutes on the clock, and a percentile measured against everyone who has taken it. No sign-up.
Take the IQ test →A Child Activist, Then a Plaintiff
Martinez's activism began remarkably early: in 2009, as a young child, he successfully petitioned a Colorado city council to prohibit pesticide use in city parks. In 2013 he became the lead plaintiff in Martinez v. Colorado Oil and Gas Conservation Commission, a lawsuit brought by seven youths against the state government over fossil fuel regulation; the Colorado Supreme Court ultimately ruled against the plaintiffs in January 2019. That same year, President Barack Obama presented him with the U.S. Volunteer Service Award. In 2015 he became one of twenty-one plaintiffs in Juliana v. United States, a landmark federal case arguing the government's climate inaction violated young Americans' constitutional rights; the case wound through the courts for nearly a decade before the U.S. Court of Appeals for the Ninth Circuit dismissed it on 1 May 2024.
A Global Voice on Climate
In 2015, at fifteen, Martinez delivered his UN General Assembly address on climate change in English, Spanish, and Nahuatl. That year he also won the Jury Award for his song "Speak for the Trees" in a UN Framework Convention on Climate Change youth music competition. His profile continued to grow: Rolling Stone named him to its "25 Under 25" list of world-changers in 2017; he received the Generation Change Award at the 2018 MTV Europe Music Awards; and Remezcla included him among "30 Latinxs Who Made an Impact in Their Communities" that year. He served as Youth Director of Earth Guardians through 2019, then transitioned to co-Youth Director alongside Marlow Baines. That January he also published an op-ed in Teen Vogue endorsing Bernie Sanders for president.
Music and Writing
Martinez built a parallel career as a hip-hop artist and singer. His debut album, "Break Free" (2018), featured stic.man of Dead Prez and actress Shailene Woodley. His third album, "TONATIUH," released in September 2025, featured Mato Wayuhi, Dallas Goldtooth, Renata Flores, and Nathan Willett, and in November 2025 he released the single "¡Basta Ya!" with fellow activist-musician Cain Culto. He has published two books: "We Rise: The Earth Guardians Guide to Building a Movement That Restores the Planet" (2017) and "Imaginary Borders," part of Penguin Workshop's Pocket Change Collective (2020). His activism has also been documented on film, in the 2020 Netflix documentary "Youth v Gov," about the Juliana case, and the 2021 French documentary "Bigger Than Us."
Why Xiuhtezcatl Is Called a Genius
Martinez is not generally framed as a genius in the sense of raw intellectual gift; his notability rests on precocious moral and rhetorical seriousness rather than any documented cognitive exceptionalism. What is striking is how early his public voice matured — petitioning a city council as a young child, addressing the UN in three languages at fifteen, becoming lead plaintiff in a state supreme court case as a teenager — and how consistently he has translated Indigenous philosophy into policy and legal argument. That is a skill of conviction, articulation, and sustained institutional engagement, cultivated by a family already embedded in environmental organizing, rather than an inborn genius operating in a vacuum. The honest counter-case is plain in his own record: both of the major lawsuits he is best known for, Martinez v. Colorado and Juliana v. United States, ultimately lost in court, and his political interventions, like his 2019 Bernie Sanders endorsement, reflect ordinary youth activism rather than singular insight. His parallel career as a musician further suggests a broad creative talent rather than a narrow intellectual one.
Legacy
Whatever the courts ultimately decided, Martinez's decade and a half of activism helped define the modern youth climate movement, turning a child's protest against pesticides into a career spanning international diplomacy, federal litigation, and recorded music grounded in Indigenous identity.
