Read here. Climate scientists and fear-mongering pundits have been banging the drums about the computer models' speculative predictions of "ocean acidification" and the resulting harm to marine life. Unfortunately, the highly gullible among us fall victim to this specific scare tactic despite the fact that marine life existed in waters of higher acidification levels for millions of years, and thrived and prospered doing so.
Fortunately for all of us (and those tasty shell fish), the actual empirical research, not the bogus computer model results, keep documenting the acidification scare falsehoods.
"...it's also good to remember that there is a large and accumulating body of research that demonstrates that extremely rapid micro-evolutionary processes are poised and ready to "kick into action" when required in almost all of earth's life forms, and that these phenomena should enable them to successfully respond to significant environmental changes at rates that correspond to the rates of those changes, as described by Balanya et al. (2006), Jump et al. (2006), Franks et al. (2007), Rae et al. (2007), Skelley et al. (2007), Van Doorslaer et al. (2007), Franks and Weis (2008), Jump et al. (2008), Purcell et al. (2008), Alford et al. (2009), Bell and Gonzalez (2009), Onoda et al. (2009) and Van Doorslaer et al. (2009)...Consequently, when all is said and done, it would appear that earth's shellfish should do just fine as the air's CO2 content continues to rise -- and gradually peaks -- near the end of the current century, as well as when it gradually returns to what it is today, some three centuries or so later..."