You can have a differential impact on biology and chemistry, so if you really want to assess what will be the status of calcifying organisms in 2100 there is one part, the chemistry, for which the organisms have no control but for the biology they can perhaps adapt and there might be a way for the organisms to mitigate the negative impacts of ocean acidification. (youris.com)
DNA recovered from calcified plaque on teeth from four Neandertal individuals suggest that those from the grasslands around Beligum's Spy cave ate woolly rhinoceros and wild sheep, while their counterparts from the forested El Sidrón cave in Spain consumed a menu of moss, mushrooms and pine nuts. (sciencenews.org)
Bloom of calcifying algae at the Barents Sea, documented by the Moderate Resolution Imaging Spectroradiometer (MODIS) on the NASA satellite AQUA. (sciencedaily.com)