MIT-WHOI graduate student Hannah Barkley is also conducting experiments to determine the impacts of higher carbon dioxide levels in the seawater. The ocean is absorbing excess carbon dioxide in the atmosphere from fossil-fuel burning. She collects the tops of cores, the only living part of the coral, which she uses to conduct experiments. (Victor Nestor, Palau International Reef Center)

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MIT-WHOI graduate student Hannah Barkley is also conducting experiments to determine the impacts of higher carbon dioxide levels in the seawater. The ocean is absorbing excess carbon dioxide in the atmosphere from fossil-fuel burning. She collects the tops of cores, the only living part of the coral, which she uses to conduct experiments. (Victor Nestor, Palau International Reef Center)