What is the story about?
Research indicates that a significant portion of sunscreen applied during recreational water activities contributes to environmental pollution, particularly
in coral reef ecosystems. Approximately 25% of sunscreen used washes off into the ocean, releasing an estimated 5,000 tons of harmful chemicals each year, which can adversely affect coral health and marine biodiversity.
The Environmental Impact of Sunscreen
Coral reefs, which occupy only 0.1% of the ocean's surface, are home to about 25% of all marine species. These ecosystems are already facing threats from climate change, pollution, and overfishing, and the chemicals found in sunscreens exacerbate these issues.When individuals shower, wash towels, or urinate after spending time at the beach, sunscreen chemicals can enter waterways, with sewage systems being a major source of contamination in oceans. Studies indicate that conventional treatment plants struggle to remove many UV filter compounds effectively.
Harmful Chemicals in Sunscreens
While sunscreens are essential for protecting skin from harmful UV rays, not all formulations are environmentally friendly. Oxybenzone and octinoxate are two common chemical UV filters linked to coral damage.A study published in 2016 revealed that oxybenzone can deform coral larvae, leading to their inability to thrive. This chemical also triggers bleaching, a stress response that can lead to starvation or death of coral if environmental conditions remain unfavorable.
The toxicity of oxybenzone is evident at concentrations as low as 62 parts per trillion, demonstrating its potential harm even in minimal amounts. For instance, nearly 2,600 visitors to Hanauma Bay in Hawaii contribute approximately 412 pounds of sunscreen to the ocean daily.
Concerns extend to other chemicals such as octocrylene, avobenzone, and homosalate, which have also been detected in marine organisms, raising concerns about food safety.
“We measured the level of oxybenzone in locally caught fish. It was alarming,” stated Craig Downs, executive director of Haereticus Environmental Laboratory. “These chemicals traverse the food chain and ultimately affect human consumption.”
Mineral Sunscreens: A Safer Alternative?
Mineral-based sunscreens, using zinc oxide and titanium dioxide, are generally regarded as safer alternatives. However, experts advise that these should be in non-nano form to minimize the risk of inhalation or absorption by marine life.Zinc oxide can contain trace heavy metals, and many products lack comprehensive ecotoxicity testing. Consumers should also consider inactive ingredients, as additives can negatively impact marine ecosystems.
Some mineral sunscreen manufacturers include additional UV filters that may pose risks to coral health, raising further concerns about the safety of these products.
Reducing Sunscreen Use for Coral Conservation
Experts recommend wearing protective clothing, such as rash guards and hats, to reduce reliance on sunscreen. This approach can significantly decrease the amount of sunscreen needed while still providing adequate protection from UV rays.“Wearing a rash guard or long-sleeve swim shirt can cover a substantial portion of your body, which means less sunscreen is required,” Downs noted, emphasizing the conservation benefits of such practices.
When sunscreen is necessary, consumers should opt for products with non-nano zinc oxide or titanium dioxide. Although mineral sunscreens may leave a white residue, newer formulations are designed to be less visible.
It is advisable to avoid aerosol sprays, which can disperse sunscreen into the environment, and to wait at least 15 minutes after application before entering the water to enhance adherence to the skin.
Regulatory Actions and Consumer Awareness
In 2018, Hawaii became the first U.S. state to ban sunscreens containing oxybenzone and octinoxate due to their detrimental effects on coral reefs. Key West, Florida, has enacted similar regulations, while Palau and the U.S. Virgin Islands have restricted a broader range of harmful chemicals.Despite these measures, the market remains largely unregulated, and terms like 'reef safe' lack standardized definitions, leading to potential consumer confusion.
“Manufacturers can label products without any validation or standardization,” warned Michael Sweet, head of the Nature-based Solutions Research Centre. “This raises concerns about what is being released into our oceans from various personal care products.”
Some independent certifications, such as Protect Land + Sea, help consumers identify products free from harmful ingredients. Although ingredient screening is valuable, it does not replace comprehensive ecological safety testing.
“Coral reefs are under significant stress,” Sweet stated. “Every action we take can help improve their chances of survival.”
