If you’re heading to Hawaii, or any other tropical paradise, to soak up the sun this winter, you might want to leave the sunscreen behind. It sounds counterintuitive after years of being told to slather on sunscreen to protect our skin from dangerous UV rays, but now research is showing that human use of sunscreen could be seriously damaging tropical coral reefs.
Senator Will Espero presented a bill to the state congress on January 20 that would ban sunscreens containing oxybenzone and octinoxate (except under medical prescriptions) in Hawaii. Espero argued that a ban is crucial to maintaining the health of coral reefs – an tourist attraction on which Hawaii relies.
Sunscreens use filters, either chemical or mineral, to block out the sun’s radiation. The chemical filters are most damaging, washing off the skin into the water while swimming, surfing, spearfishing, or even using a beach shower. Researchers have measured oxybenzone in Hawaiian waters at concentrations that are 30 times higher than the level considered safe for corals. According to Hawaii’s Department of Land and Natural Resources:
“[These chemicals] cause deformities in coral larvae (planulae), making them unable to swim, settle out, and form new coral colonies. It also increases the rate at which coral bleaching occurs. This puts coral reef health at risk, and reduces resiliency to climate change.”
Says Craig Downs of Haereticus Environmental Laboratory in Virginia, whose research on stunted coral growth has heavily influenced Espero’s bill:
“Oxybenzone — it kills [coral]. It turns them into zombies if it doesn’t kill them outright. It makes them sterile and you do not get coral recruitment.”
This problem is not unique to Hawaii. Approximately 80 percent of the corals in the Caribbean Sea have died over the past 40 years. While there are many compounding factors, such as temperature anomalies, overfishing, coral predators, coastal runoffs, and pollution from cruise ships and other vessels that affect coral health, the fact that an estimated 14,000 tons of sunscreen wash off annually into the world’s oceans is a serious matter. (Source)