193. Yes, Your Sunscreen Could Be Killing Coral Reefs with Katie Day

Coral reefs are often called the “rainforests of the sea.”

They provide habitat for an incredible diversity of marine life, protect shorelines from storms, and support the livelihoods of millions of people around the world.

But reefs are also among the most threatened ecosystems on Earth.

Rising ocean temperatures, pollution, and coastal development all play a role in their decline—and now, research shows that something as ordinary as the sunscreen we put on at the beach could be part of the problem.

Certain chemical ingredients found commonly in sunscreens have been linked to coral bleaching, genetic damage in marine species, and even harm to the tiny phytoplankton that form the base of the ocean’s food chain.

Some places, including Hawai‘i, have already banned these types of sunscreens in an effort to protect fragile reef ecosystems.

But with labels like “reef-safe” popping up everywhere, it’s not always clear what’s marketing spin and what’s truly safe for our oceans.

To help us untangle the science and policy behind sunscreen and reef health, we’re joined by Katie Day, Surfrider Foundation’s Senior Manager of Science and Policy.

Katie grew up on a small island in the U.S. Virgin Islands, where her love for the ocean first began. With a Master’s Degree in Environmental Science and Management, she brings expertise in climate policy, water quality, and habitat management.

At Surfrider, she helps guide national campaigns with the latest science, leads federal advocacy efforts, and heads up the organization’s annual Coastal Recreation Hill Day in Washington, D.C.

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Surfrider Foundation

Website: https://www.surfrider.org/

Reef-Safe Sunscreen Guide: https://www.surfrider.org/news/surfrider-foundations-2025-reef-friendly-sunscreen-guide

Instagram: https://www.instagram.com/Surfrider

Facebook: https://www.facebook.com/surfrider/

LinkedIn: https://www.linkedin.com/company/surfrider-foundation/