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Pollution

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researcher working with mercury

MEDDLESOME MERCURY  Increased runoff into Earth’s oceans could increase methylmercury concentrations in marine ecosystems by altering the food web, new laboratory tests show. Here a researcher adds methylmercury to a vat containing coastal microbes.

pile of junk

TONS OF STUFF  The combined mass of all human-created products has eclipsed the mass of nature-made products, including humans, researchers estimate.

Ozone hole

A study reported this year confirms that the Antarctic ozone hole is healing. Blue and purple represent areas with the least ozone in this depiction of total ozone from September of this year.

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