I was asked recently to write a guest posting for the Reeftank as part of their effort to grow a scientifically minded audience. Not really having any extra time, (newborns will do that to you!) I offered and they accepted a recycling of a previous posting from October last year.
It is called "The other CO2 problem" and they published it here.
The more geoengineering discussions creep into the mainstream dialogue, the more critical it is to remember this issue.
(original posting can be found here)