In-N-Out Burger’s iconic palm trees are a reference to buried treasure, but they also make the restaurant a very unlikely climate change indicator. As the chain expands into places where palm trees can’t yet grow, science writer Meg Duff wondered: Does In-N-Out know something we don’t?

The Outside Podcast is made possible by Outside+ subscribers. Learn more about all the benefits of becoming a member and sign up at OutsideOnline.com/podplus.