Read here. Contradicting all the global warming alarmist claims and predictions that coral reefs are being killed by human CO2, the world's largest reef is prospering under conditions of higher CO2. Why? First, human CO2 does not harm corals, nor does a slow rise in temperature as experienced by the world since the end of the Little Ice Age. Secondly, if no-fishing regulations are enforced in coral reef areas, the entire coral environment improves, dramatically - this has been known science for many years.
"The results are actually quite impressive. Having a higher proportion of protected areas is good for marine life, it's good for fish and it's good for people who rely on the reef for a living...."
For more information about coral reefs, go here.