Kategorie: News
Greenwashing on the reef: The whole truth
Anyone snorkelling or diving on tropical beaches wants to enjoy the colourful coral reefs – whilst at the same time protecting their own skin from UV radiation. Many holidaymakers therefore opt for sun protection products advertised as ‘reef-safe’.
Unfortunately, the term ‘reef-safe’ is rather misleading and lulls consumers into a false sense of security. This is because even such sun creams contain chemicals that have been proven to damage marine ecosystems – particularly corals, which are already under pressure from climate change and overfishing.
What does ‘reef-safe’ really mean?
The term “reef-safe” is not legally protected and is not subject to any uniform standards. Manufacturers use it freely, often simply because they omit certain ingredients such as oxybenzone or octinoxate – two UV filters that have been banned in Hawaii and some other regions. Yet the problem extends far beyond these two substances.
Scientists warn that virtually all common chemical UV filters – whether oxybenzone, octocrylene, avobenzone or newer alternatives – can harm corals and other marine life. Studies show that these substances are toxic even at very low concentrations. They disrupt coral reproduction, impair their growth and contribute to so-called coral bleaching, a process in which the symbiotic algae that give corals their colour and vitality die off.
How do sunscreens end up in the sea?
There are many ways in which these chemicals enter the water: bathers rinse off their sun cream whilst swimming. Showers taken after a visit to the beach carry residues via sewage systems into rivers and ultimately into the sea. In popular tourist areas, several kilograms of UV filters can thus end up in sensitive coastal waters every day.
The situation is particularly dire at heavily frequented reefs. Research along the Thai coast, in the Caribbean and on the Great Barrier Reef shows elevated concentrations of sunscreen chemicals – precisely where coral communities are already weakened.
Mineral filters: better, but not perfect
Mineral sunscreens containing zinc oxide or titanium dioxide are considered an alternative. These physically reflect UV radiation rather than chemically absorbing it. In fact, they are less toxic to corals than many chemical filters.
However, there is a catch here too: many products contain these minerals in nano-sized particles so that they spread more easily and do not leave a white film on the skin. However, nanoparticles can be taken up by marine organisms and accumulate in the food chain. The long-term effects have not yet been fully researched.
What can environmentally conscious beachgoers do?
Experts recommend a multi-layered approach:
- Clothing instead of chemicals: Long-sleeved UV-protective shirts, hats and sunglasses offer physical protection without any chemicals.
- Specialist rash guards or wetsuits are ideal, particularly for snorkelling or diving – they provide complete protection for the skin and do not pollute the water.
- Seek shade: UV radiation is at its strongest between 11 am and 3 pm. Staying in the shade during this time, or scheduling water sports for the morning or evening hours, significantly reduces the risk of sunburn.
- Use mineral sun cream selectively: If sun protection is unavoidable, choose products containing non-nano zinc oxide or titanium dioxide. Important: Only apply cream to exposed skin and allow the product to absorb properly before entering the water. This minimises the amount that gets washed off.
- Timing is key: Apply the cream 30 minutes before swimming, if possible, so that the active ingredients adhere better. After swimming, reapply the cream on dry land rather than immediately before your next dip.
The industry’s responsibility
Consumer advocates and marine biologists are calling for stricter regulation. As long as ‘reef-safe’ remains a marketing term without any scientific basis, manufacturers will continue to benefit from greenwashing. Independent quality marks and mandatory ecotoxicity tests could provide clarity.
At the same time, researchers are working on innovative solutions: sunscreen ingredients derived from algae that naturally block UV radiation, or biodegradable formulations that leave no persistent residues. However, until such products are ready for the market, caution remains the best strategy.
Corals need more than just “safe” sun cream
The debate surrounding sun cream is part of a bigger picture. Coral reefs are suffering from rising water temperatures, ocean acidification, eutrophication from agriculture and destructive fishing methods. Sun cream alone is not the main enemy – but it is a preventable stress factor.
Every beachgoer can make a difference by making informed choices. Anyone who wants to protect the beauty of the underwater world should not just rely on the ‘reef-safe’ label, but actively choose alternatives. After all, the best sunscreens for corals are those that don’t end up in the water in the first place.
Summary: Next time you’re planning a beach holiday, pack UV-protective clothing, find out about local marine conservation programmes and question the claims made in adverts… The world’s reefs will thank us all – with their biodiversity, their vibrant colours and their vital role as the foundation of life.