This almost did make it to the list! It is also odd that it is not already part of the long "Our Climate Our Future" video series that did make it to the list, because they are both by the Alliance for Climate Education.
The reason it was taken out is because the "Climate Science" videos by Planet Nutshell cover ocean acidification in Episode 8 - Climate Change in the Oceans.
But feel free to add an answer with the link.