Here is an interesting link about changing sea water compositions over time and its impact on corals

http://www.sciencedaily.com/releases/2004/11/041116232307.htm

I wonder if anyone is looking at the impact the changing chemical composition from human waste and building material run off is having - could this be another factor in the coral die-off?

If anyone has other links about this, I would be interested in reading them.
thanks