Considering krill

The ABC is carrying a short report as follows:

Tasmanian scientists have released ground-breaking research which shows increasing ocean acidification is deadly for Antarctica's main food source.

The team at the Antarctic Division has studied the impacts of increased levels of carbon dioxide on the shrimp-like krill.

Scientists exposed the laboratory krill embryos to varying levels of carbon dioxide; from as little as 380 parts per million which is the current surface level, to 2,000 parts per million.

The embryos exposed to the highest level did not survive.

Krill Biologist Rob King says with carbon dioxide levels predicted to double by the end of the century, the next step is to find the exact tipping point.

Well, given that 2000ppm is (I think) never likely to be reached, I'm not exactly panicked about effects at that level. But, even if the effect at around the 500 - 800 ppm mean less successful reproduction, it could be a worry.