claim: “[ … ]The impact on calcification, metabolism, growth, fertility and survival of calcifying marine species when pH is lowered up to 0.3 units [ … ] is beneficial, not damaging.
evidence: It is expected to drop by a further 0.3 to 0.5 pH units ( an additional doubling to tripling of today's post-industrial acid concentrations ) by 2100 as the oceans absorb more anthropogenic CO 2, the impacts being most severe for coral reefs and the Southern Ocean.