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It’s not every day a 16-year-old environmental activist who’s given three speeches at the U.N. and has filed a landmark constitutional climate change lawsuit against the federal government graces the television.

On Friday (June 24), Bill Maher welcomed his youngest guest, Xiuhtezcatl Tonatiuh Martinez, to his weekly HBO talk show, Real Time with Bill Maher. The teen activist of indigenous Mexican descent gave Maher a simplified breakdown of the Aztecs before diving into the real reason he was there – climate change.

“Climate change is the defining issue of our time,” Martinez told the host. “Young people are ready to use their art, their poetry, their passion, their music to engage with the world and be leaders today. Sure, we’re a future generation, but we’re here now, and we’re not going to wait to make a difference,” he continued.

Maher pointed out that he’s not “typical” in his generation. It’s true. Martinez became involved in climate activism at the age of six. He is currently the youth director of Earth Guardians, an organization devoted to youth environmental activism.

Hear one of his three U.N. speeches, and the most viral, on climate change: