Regarding Ocean Acidification, how does the carbon dioxide overwhelm the ocean’s normal pH buffer…
Philippa Somerville

That is probably why the Ocean remains alkaline, not acidic. “On the PH scale, Seven is neutral. Over the past 300 million years, ocean pH has been slightly basic (alkaline), averaging about 8.2. Today, it is around 8.1, a drop of 0.1 pH units, representing a 25-percent increase in acidity over the past two centuries.” It is more honest to say that the ocean is slightly less alkaline that it used to be: it is certainly not acidic, not even close to neutral.

Before panicking over the supposed “Acidification” of the oceans, consider these facts:

  • Ocean pH varies by +/- 0.3 naturally.
  • Claims of acidification since 1750 are based on dubious models and few observations.

There are reasons to assume that marine life will not be overly affected by an increase in ocean acidity due to atmospheric carbon dioxide:

  • Ocean life evolved and survived far higher levels of CO2 for millions of years in the past.
  • Marine organisms actively create carbonate shells (using energy) which means crustaceans, corals and molluscs aren’t automatically prey to pH changes in the same way that say a limestone rock would be.
  • The world’s oceans may have warmed a mere 0.17C since 1955, hardly a significant threat to marine life.
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