Ocean acidification will have drastic effects on shelled organisms and on coral reefs, but what about its effects on humans? Many people mistakenly believe that the oceans may be turning to acid, and that it will no longer be safe for humans enter the water. This is not true, even in the most extreme scenarios for the next century. An ocean pH of 7.8 is in not directly harmful to humans, in fact many swimming pool maintenance guides suggest that people keep their pool pH between 7.2 and 7.8.