Today's big green unvalidated computer model seems to be the one that tells us that the oceans are all shortly going to be devoid of life due to acidification by man. The story gets an outing on the BBC (where else) along with several other media outlets.
The world's oceans are becoming acidic at an "unprecedented rate" and may be souring more rapidly than at any time in the past 300 million years.
In their strongest statement yet on this issue, scientists say acidification could increase by 170% by 2100.
Probably time to wheel out Matt Ridley's review of the literature on the subject again.