Calling a decline in pH of ocean water from 8.2 to 8.1 (which is calculated to have happened over recent decades, perhaps in response to rising atmospheric carbon dioxide concentration though other causes are possible) “acidification,” meaning “becoming more acidic,” is misleading at best. Something can’t become “more acidic” unless it’s already acidic, and a solution with a pH higher than 7.0 is by definition not acidic but basic. Earth's five oceans vary in pH from about ~7.9 to ~8.3, and pH … [Read more...]