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Pollution can seem like a vague, general problem, but sometimes it is specific and personal.

People with asthma living in some major cities know to keep tabs on the ozone report in the weather forecast, for example.

Mercury is a problem for marine fish, as well—particularly the ever-popular tuna.

Mercury emitted by burning coal finds its way from the atmosphere into seawater, but an additional step is necessary to weaponize the heavy metal.

Since predators are made up of all the many critters they eat, this mercury accumulates to greater and greater levels at each step in the food chain.

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