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Whether man-made sources of mercury are contributing to the mercury levels in open-ocean fish has been the subject of hot debate for many years. My colleagues Carl Lamborg, Marty Horgan and I analyzed data from over the past 50 years and found that mercury levels in Pacific yellowfin tuna, often marketed as ahi tuna, is increasing at 3.8% per year.

The results were reported earlier this month in the journal This finding, when considered with other recent studies, suggests that mercury levels in open-ocean fish are keeping pace with current increases in human-related, or anthropogenic, inputs of mercury to the ocean. These levels of mercury – a – are now approaching what the EPA considers unsafe for human consumption, underscoring the importance of accurate data. Drivers Motherboard Ecs 945gzt M. With this article, I’ll explain the evolution of the science to this point and our findings. I expect our analysis will either quiet the debate or add more fuel to the fire.

Ocean sensitivity Motivated by the seminal environmental book, environmental chemists have long found widespread mercury pollution in wastewater from industrial activities. Surprisingly, mercury also appeared far from point sources – in “pristine” lakes of Scandinavia and northeastern North America. It took many years and careers to understand why mercury wound up in these “pristine” lakes. Once emitted from natural or man-made sources, such as coal-burning power plants, mercury can travel as a gas many times around the globe before falling with rain, snow, or dust.

Once out of the air and in the water, it can then be taken up by fish. There has been a false perception, however, that the open ocean – far removed from point sources of pollution – is too voluminous to be polluted with mercury from atmospheric fallout. The shorthand for saying oceans can’t be significant sinks for air-borne pollutants is “dilution is the solution to pollution. Langmann here. ” The argument is that lakes are concentrated environments because they are in direct contact with their watersheds that collect rain and snow, but the deep open ocean is an extremely dilute environment. It took years before people understood how airborne mercury from burning coal at power plants could accumulate in fish., Two manuscripts published in Science in the early 1970s supported this argument. The stated that mercury pollution could only result in a negligible increase in mercury levels in open ocean water. But my colleagues and I found these conclusions were based on faulty data. Before the advent of clean sampling techniques that prevent contamination before, during, or after collection, it was accepted that natural mercury levels of open ocean waters ranged in the low parts-per-billion.