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Summary
Scientists sampling the Atlantic Ocean found that its surface layer, a thin film that normally teems with tiny plankton and helps regulate water vapor and clouds, is instead mostly empty of plankton and loaded with microplastics, soot, and "forever chemicals." This matters because that surface film plays a role in climate regulation beyond just CO2, and its pollution-driven breakdown could affect weather patterns, ocean health, and ultimately the food chain we depend on, suggesting we need to fight plastic and chemical pollution alongside carbon emissions, not instead of them.
Abstract. Climate policy treats carbon dioxide as the single lever on the climate. We suggest a second one has been overlooked: the marine biodiversity that builds and maintains the ocean surface microlayer (SML) and that pollution is now degrading. Water vapour, not CO₂, is the largest single contributor to the natural greenhouse effect and the strongest feedback on warming. The ocean supplies most of that vapour across the 71% of the planet it covers, and the thin biogenic lipid-and-surfactant film phytoplankton spread over the sea surface helps govern how readily it evaporates and forms aerosol. That same film gathers lipophilic "forever" chemicals, together with the microplastic and black-carbon soot they cling to, to levels far above the water beneath, where they turn toxic to the plankton that hold the ecosystem together. An automated image pipeline sized and classified 51,547 particles larger than 20 μm in 352 georeferenced surface samples from eight sailing vessels crossing the trade-wind North Atlantic. Zooplankton were absent from 93.8% of stations. Black carbon appeared at 89.8%, microplastic particles at 69.9%, microfibres at 22.4% and phytoplankton at 81.8%; 99.2% of everything counted measured below 200 μm. A separate 110-image, GPS-tagged crossing returned zero zooplankton at every point on the track, and a plankton net towed at the surface by day and by night confirmed the scarcity directly, returning roughly 0.2 to 0.5 animals per cubic metre – far below any productive ocean. In short, this surface layer is stripped of animal plankton and steeped in combustion and plastic residue. We trace what that may mean for the microlayer, for water-vapour feedback and cloud formation, and for ocean pH, and argue that cutting pollution has to sit beside cutting carbon.