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Ocean Life


Red Tides and Dead Zones

The most widespread, chronic environmental problem in the coastal ocean is caused by an excess of chemical nutrients. Over the past century, a wide range of human activities—the intensification of agriculture, waste disposal, coastal development, and fossil fuel use—has substantially increased the discharge of nitrogen, phosphorus, and other nutrients into the environment. These nutrients are moved around by streams, rivers, groundwater, sewage outfalls, and the atmosphere and eventually end up in the ocean.

Red Tides and Dead Zones
Deep-Sea Diaspora

Deep-Sea Diaspora

When spectacular biological communities were first discovered at hydrothermal vents in 1977, biologists puzzled over…
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