Here's a look:
|Forty years ago Carysfort Reef, off of Key Largo, was a thriving, thickly settled neighborhood of corals.|
It was designated a national marine sanctuary.
Now the whole area is blighted. Source: Science Daily via Robertscribbler.
From the National Geographic via Robertscribbler:
“ 'Lots of scientists think that ocean acidification is not going to be a problem until 2050 or 2060,' says Chris Langdon, a marine biology professor at the University of Miami’s Rosenstiel School of Marine and Atmospheric Science. 'This is happening now. We’ve just lost 35 years we thought we had to turn things around.' "
More here, here and here.