A rather worrisome paper has just been published in Science magazine. The authors conclude:

[T]he current rate of (mainly fossil fuel) CO2 release stands out as capable of driving a combination and magnitude of ocean geochemical changes potentially unparalleled in at least the last ~300 [million years] of Earth history, raising the possibility that we are entering an unknown territory of marine ecosystem change.

An excellent summary is available on Ars Technica (which is where I first read about this paper).  The paper is B. Hönisch et al, ‘The Geological Record of Ocean Acidification’, Science, vol. 335, no. 6072, pp. 1058–1063, Mar. 2012. DOI: 10.1126/science.1208277.

On the plus side, reading about this research has given me more enthusiasm to finish insulating our bedrooms this weekend!