Scientific American: The shells of tiny ocean animals known as foraminifera–specifically Globigerina bulloides–are shrinking as a result of the slowly acidifying waters of the Southern Ocean near Antarctica. The reason behind the rising acidity: Higher carbon dioxide (CO2) levels in the atmosphere, making these shells more proof that climate change is making life tougher for the seas’ shell-builders. Marine scientist Andrew Moy at the Antarctic Climate & Ecosystems Cooperative Research Center (ACE) …