ANSWER (CURRENTLY UNDER REVIEW): A gradual yet steady change of ocean chemistry marked by a decrease in pH that is caused by increasing concentrations of carbon dioxide in the atmosphere. This answer is focused on changes to the ocean over recent decades. More »
ANSWER (CURRENTLY UNDER REVIEW): Bacteria use up the oxygen in the process of breaking down organic matter, like the waste from tiny animals and dead algae. This answer is focused on coastal ocean waters, but generally applies to deep waters in estuaries, ponds, lakes, and slow-moving stretches of rivers. Check out the infographic that explains how this works. More »
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