Could ships give fish high blood pressure?

摘要

If I had openly suggested twenty-odd years ago that discharging the water from a ship's ballast tank into the surrounding sea was a serious environmental issue you would have probably considered me doolally, a likely candidate for the loony bin. And when I now say that there's an outside chance that discharging salt water from a ship's desalination plant or cooling water system could be an issue for shipping over the course of the next decade, you're probably thinking they should throw away the key.