McClatchey: The gradual increase of acid in the oceans threatens coastal communities in 15 states, although the reason for the impact and what to do about it varies widely, according to a new study. Writing in the journal Nature Climate Change, a group of researchers declared ocean acidification a complex and seemingly overwhelming problem. Thats partly because of its varied nature, and partly because of big gaps in what is known about it. States are at risk, according to the study, because of straight...