Climate change doesn’t just mean that the global mean surface temperature is increasing.  Because oceans absorb heat, they too increase their temperature.  The upper layers are affected first, but as warming increases, lower and lower depths also increase in temperature.

All the science is the world isn't going to do anything if we choose not to take action

Some species may be able to adapt to the changing ‘ocean climate’, but when changes happen rapidly enough that evolutionary processes aren’t keeping up, that’s when the real problems start to seep in.

The FAO have taken a look at the socio-ecological impacts of climate climate change and ocean acidification on a human community in Kenya that utilizes reefs for their livelihoods and survival