The effects of ocean acidification on the marine biosphere have yet to be documented.  Laboratory experiments suggest beneficial effects for a few species, with potentially highly detrimental effects for a substantial number of species.  With medium confidence, Fischlin et al. (2007)  projected that future ocean acidification and climate change would impair a wide range of planktonic and shallow benthic marine organisms that use aragonite to make their shells or skeletons, such as corals and marine snails ( pteropods ), with significant impacts particularly in the Southern Ocean.
“Attention-deficit drugs increase concentration in the short term, which is why they work so well for college students cramming for exams. But when given to children over long periods of time, they neither improve school achievement nor reduce behavior problems. The drugs can also have serious side effects... Many parents who take their children off the drugs find that behavior worsens, which most likely confirms their belief that the drugs work. But the behavior worsens because the children's bodies have become adapted [because the drugs are habit-forming] to the drug. Adults may have similar reactions if they suddenly cut back on coffee, or stop smoking.”