Noisier Ocean Environment!

I'll admit that I'm not the most educated on matters concerning global warming. I know the basics, but I recognize that that's not enough. Whilst browsing the net, I found some articles that gave me a little more knowledge...and a bit of a shock!
Firstly, I found an article on Arctic Ice. Apparently, these last few years have seen record lows in the amount of ice coverage at the Pole. Scary thought, but it's to be expected really...the ocean is being heated more than ever. The changes brought by global warming are showing themselves here.
A second article I found showed another change brought by global warming. One which an uneducated mind would never have expected! Not only are we heating the oceans, but we're making it noisier for the mammals and ocean creatures. If someone told me that, I would expect that the noise was solely due to increased activity on the waves. This time a century ago, there were fewer reasons to be on the oceans, and less need for it. Today, we have offshore oil rigs, huge fishing vessels, commercial and vacational monsters, communications lines... So it would be expected that there would an increase in noise reaching the ocean creatures. Makes sense to me. But, scientists have found that as well as this increased ocean usage, global warming is also making it noisier for the creatures. I would never have made this connection! But it has been researched - global warming creates an increased-acidic ocean. I guess this ties in with acid rain. But apparently, the increased acid makes it easier for sounds to travel underwater. Making our noise travel further and faster. We're not only making it difficult to survive underwater (I'm sure a change in acidity must kill or maim some of the ocean creatures) but we're making it unlivable as well......
It makes me wonder what other unbelievable affects we are having on this world.

Sounds Travel Farther Underwater As World's Oceans Become More Acidic http://www.sciencedaily.com/releases/2008/09/080929144116.htm

Arctic Sea Ice Hits Second-lowest Recorded Extent, Likely Lowest Volume
http://www.sciencedaily.com/releases/2008/10/081002172436.htm