http://http://www.npr.org/templates/story/story.php?storyId=121378547
This was a study on the rising CO2 levels in ocean waters around the world. They study the effects of the CO2 on the shells of aquatic animals, the result, lobsters were incredibly well suited for the environment. The other animals in their tests however where weakened if not destroyed in the tests.
This shows that the CO2 levels on earth effect more than just the air and global climate, but the waters as well. If we do not reduce emissions and clean up what is already in the air we are headed down a terrible path. The worlds atmosphere will no longer be condusive to life, instead becoming a death trap for any remaining organisms.