Cliff Ollier on the myth of ocean acidification:
‘Acid’ is an emotive word to the general public, which is why it is seized upon by the alarmists in their search for yet another scare. In reality increasing CO2 makes the ocean become ‘less alkaline’, but never ‘acid’.
[…]Many marine organisms need CO2 to make their coral skeletons, carbonate shells and so on. Corals also have symbiotic plants within their flesh that use CO2 in photosynthesis.
[…]The pH of sea water can be very variable and makes temperature measurement look like child’s play. Ocean pH varies regionally by 0.3, and seasonally in a particular location by 0,3. But nobody has ever measured ocean water below 7, which is what “acid” means. Rhodes Fairbridge told me that he found the day-night variation in a coral pool was 9.4 to 7.5.
[…]One of the factors affecting ocean pH is photosynthesis by plants. Experimental results show that plants grow better if CO2 is increased, and greenhouse managers commonly increase the CO2 artificially to increase crops, often by 30% or more. There is every reason to suppose that marine plants also thrive if CO2 is increased. There is also experimental evidence that carbonate secreting animals thrive in higher CO2. Herfort and colleagues concluded that the likely result of human emissions of CO2 would be an increase in oceanic CO2 that could stimulate photosynthesis and calcification in a wide variety of corals.