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Where the pH is the lowest, corals can no longer grow - sand, rubble and seagrasses replace the reef.
Photo

Lonely Seagrass in Acidic Waters

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This orange boring sponge (Cliona varians) overgrows several coral species at Panama's Smithsonian Tropical Studies Institute.
Article

Ocean Acidification Excites Boring Sponges

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Two nurse sharks hover over a baited cage
Lesson Plan

Caribbean Coral Reef and Climate Case Study

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The acidic waters from the CO2 seeps can dissolve shells and also make it harder for shells to grow in the first place.
Photo

Dissolving Shell

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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
Article

Coralline Algae: The Unsung Architects of Coral Reefs

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Intense volcanic CO2 vents in Ili Ili Bua Bua, Normanby Island, Papua New Guinea.
Slideshow

Will Coral Reefs Survive Acidification?

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Tiny organisms found on ARMS
Article

From Field to Lab: How Carbon Seeps Provide a Chance to See Future Impacts of Ocean Acidification

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A shell placed in seawater with increased acidity slowly dissolves over 45 days.
Overview

Ocean Acidification

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A bluefin trevally swims in Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument.
Slideshow

Two Views of Coral Reefs: Thriving and Threatened

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