Well, acidification anywhere in the oceans is a result of human activity, because the increased absorption is due to increasing atmospheric concentrations. But the tropics are less affected, because you get the most effect where the absorption is strongest. Warm waters with light winds = least effect.
Change in sea surface pH caused by anthropogenic CO2 emissions between the 1700s and 1990s.
Well, acidification anywhere in the oceans is a result of human activity, because the increased absorption is due to increasing atmospheric concentrations. But the tropics are less affected, because you get the most effect where the absorption is strongest. Warm waters with light winds = least effect.The link in comment# 37 says that CO2 was absorbed by the oceans 1000 years ago. So whatever is ailing the coral reefs, it isn't AGW. CO2 is also released from natural fires and volcanic emissions, not just human activity.