How reef-safe are reef-safe sunscreens, really?

two snorkellers diving on coral reef - in jurisdiction where only some 'reef-safe' sunscreens are permitted
Snorkellers in Hawaii, US. Hawaii is one of the handful of jurisdictions around the world that's introduced legislation on 'reef-safe' sunscreens. Credit: Mike Tittel / Getty Images

While governments and businesses are racing ahead with brands and labels, scientists are still pondering the effects of sunscreens on corals in the lab.

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