Coastal ‘dead zones’

I just read an article on costal ‘dead zones’ spreading globally. I was pointed to it via Adam Curry’s Daily (actual weekly ;)) Source Code #783, first thought was: “should I be worried for my home country, NL??”. Reading the article and remembering that the North Sea is (/was?) one of the cleanest seas around due to the constant flow of ocean water, I came to the conclusion that NL is safe…yet, are we? With a nearly 100% increase of these ‘dead zones’ every decade, I’d say we need to have a close look at our behaviour against mother nature!