The Ocean Health Index is like the thermometer of the ocean. It will allow us to take the temperature to know what is going on at the global level, trying to integrate different impacts, including overfishing, invasive species, coastal development, and climate change.

I dream of diving in two places where I have not been yet. One is Antarctica, because of its crystal clear waters and amazing fauna, in addition to the ice cathedrals. The other is the Arctic, where I'd like to see the northernmost kelp forests.

The ocean is like a checking account where everybody withdraws but nobody makes a deposit. This is what's happening because of overfishing.

Most of the reefs [around Christmas Island] are dead, most of the corals are dead, overgrown by algae, and most of the fish are smaller than the pencils we use to count them.

In the Mediterranean of my childhood, there were no large groupers, sharks, or whales. All I saw was seaweed and a few fish, smaller than my little diving mask. All the large animals were gone, simply because we had eaten them.

I was studying the impacts of fishing on ocean life, while the places that I loved so much continued to decline: less and smaller fish, less corals, and more microbes. I found myself writing the obituary of nature with increasing precision. Unsatisfied and frustrated, I felt like a doctor telling the patient how she is going to die, with excruciating detail. If I were that patient, I would have fired myself and looked for a doctor who would look for a solution.

What we have now - a world without [marine] reserves - is like a debit account where we withdraw all the time and we never make any deposit. Reserves are like savings accounts.