The oceans cover two thirds of our planet. They are home to a rich source of life and regulate our climate balance by their very existence. The survival of many populations and species depends on them: the marine ecosystem is made up of several micro-ecosystems that are essential to regulate the oxygen and carbon dioxide content of the atmosphere we breathe.
This fragile ecosystem is now threatened by a variety of factors responsible for the extinction of hundreds of species and the depletion of resources: global warming, rising sea levels, overexploitation of resources, etc. But it’s also under threat from pollution from sun creams and their filters, which are a danger in their own right to the oceans. This damage is responsible for the extinction of hundreds of species and a considerable depletion of resources. We must act now collectively if we are to save our oceans.
50% of marine species are sheltered by coral reefs. 500 million people depend on the ecosystem provided by coral reefs.
Corals are central to the marine ecosystem. They are a food resource and habitat for many plants, bacteria and fish, they protect soils and coasts from run-off and/or erosion, and lessen the impact of hurricanes and tsunamis. Corals are therefore a vital link in the survival of marine ecosystems. Found in all seas and depths, they can live for thousands of years. But today, ¾ of coral reefs are threatened by humans, while 30% have already been irreparably lost over the last 30 years, notably damaged by sun products.
Chemical agents in sun creams are the cause of the progressive destruction of algae and, by extension, of corals. How does they cause damage? Some of these molecules destroy zooxanthellae, which are micro-algae living in symbiosis with corals. When in contact with harmful molecules, zooxanthellae die, taking with them the surrounding corals, which first turn white and then perish in just 48 hours. But octocrylene is also a culprit: its toxicity on corals was highlighted by a team of researchers from the Observatoire océanologique de Banyuls-sur-Mer in a study published in 2018 in Analytical Chemistry journal, leading to the banning of toxic sun creams containing this molecule in the Palau Islands in early 2020.
*source : Green Cross
**source: study by the Faculty of Science of the Polytechnic University of the Marches in Italy
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