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Using Lichen to Point to Pollution

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All those ships coming into port and the trucks driving off with their cargo generate a whole lot of air pollution. But it doesn't stay by the coast. It blows east. In fact, air pollution is becoming a big concern in California's national parks. In Yosemite, researchers are trying to measure the damage it's having there and they're using an unlikely tool: a unique kind of fungus called lichen.

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