David – There are multiple problems with the WUWT post on OA. I’ve discussed ocean acidification many times here previously and so I don’t want to go through it again in a thread devoted to something else (I’m also preparing an article to be posted on another website soon – not a blog though). Although I don’t want to divert this thread into an OA argument, you are welcome to email me. You can find out how via the denizens page. Others have emailed me on occasion and I’ve always responded.
Two other alternatives are (1) wait for my web article, which I can refer you to when it appears, or even better (2) read the Nature Climate Change article that Matt Ridley refers to, or if you can’t, find some other way to learn its content via a scientific source that gives a full overview of the data. If you find out what the article actually says and compare it with the impression Ridley tries to give, you’ll get a sense of how WUWT has misrepresented this topic.