And the seas will be as blood...

[DeepIron]

http://news.bbc.co.uk/2/hi/science/nature/7241428.stm

The second angel poured out his bowl into the sea, and it became blood like that of a dead man; and every living thing in the sea died. Rev 16:3

Something to chew on whether you want to attach a scriptural perspective or not.

As the article points out this is the first time data has been correlated to display the culmulative impact of humans on the oceans in a global scale. Considering that most of the O2 we breath comes from the oceans biosphere, maybe we ought to pay attention to this...