Mexican American Mario Molina was a modern-day hero who helped solve the ozone crisis of the 1980s. Growing up in Mexico City, Mario was a curious boy who studied hidden worlds through a microscope. As a young man in California, he discovered that CFCs, used in millions of refrigerators and spray cans, were tearing a hole in Earth's protective ozone layer. Mario knew the world had to be warned--and quickly. Mario went on to become a Nobel laureate and a recipient of the Presidential Medal of Freedom. His inspiring story gives hope in fighting the ongoing climate crisis.

Elizabeth Rusch is the author of many books for young people, including All About Nothing, Zee Grows a Tree, and The Big One. She lives in Portland, Oregon.
Teresa Martínez has illustrated several books for children, including Again, Essie? and How to Explain Coding to a Grown-Up. She lives in Puerto Vallarta, Mexico.

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