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Lamlash Bay marine reserve with Holy Island in the background. 
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Lamlash Bay

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Sea walls must be maintained consistently and will need to be built higher and higher as sea level rises. This type of man-made barrier also has implications for the natural coastline.
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French Sea Wall

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The Portage Glacier near Anchorage, Alaska has retreated so much that it is no longer visible from the visitor center built for its viewing in 1986.
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Portage Glacier

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A map of sea level change in cm from 1993 to 2008.
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Sea Level Rising

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An iceberg calves from Antarctica's Pine Island Glacier
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Pine Island Glacier

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An Autonomous Reef Monitoring Structure (AMRS) placed on a reef in Bali.
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Biodiversity in Bali

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Seagrass species come in many different shapes and sizes, as illustrated by this conceptual diagram of some common seagrass species.
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Seagrass Diversity

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The Mesoamerican Reef extends over 600 miles (1000 km) through the waters of Mexico, Belize, Guatemala and Honduras and includes the Western Hemisphere’s longest barrier reef.
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Mesoamerican Reef Regional Map

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Blue mussels use byssus threads (which you can see on the right, in front of the barnacle shell) to attach to rocks and sometimes to stop a predator from making them a meal.
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Byssus Threads on a Blue Mussel

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EPA divers from Atlanta place this instrument in Charleston Harbor in order to monitor currents and better predict sand movement for a harbor deepening project.
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Measuring Underwater Currents

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This beautiful turquoise and purple creature is an aeolid nudibranch. The aeolid nudibranch is covered by branches that are actually gills, called cerata. The cerata also contain parts of the nudibranchs digestive system.
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Red-lined Nudibranch

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Christian McDonald, the Scientific Diving Safety Officer at the Scripps Institution of Oceanography, tows a surface float at Millennium Atoll in the South Pacific.
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Diver With Shark

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