Ocean acidification is a danger to all underwater ecosystems. The slight change in acidity makes animals have a hard time building stronger parts out of calcium carbonate, because that is what is disappearing. Scientists predict that in the year 2100, the pH will have dropped by 0.3. This may not seem like a huge decline, but this much will cause polar pteropods to disappear altogether. Phytoplankton and zooplankton will have a similar fate, but later, because they are formed by calcite. Ocean acidification will also cause non existence for coral reefs, such as the Great Barrier Reef. The oceans are becoming more acidic, and the outcomes are at the point where they are notably inevitable.
