There are several changes we are seeing. One big change is within 50 years, we've taken and eaten more than 90% of the big fish in the sea, nearly half of the coral reefs have disappeared, and there has been a mysterious depletion of oxygen in large areas of the Pacific.
With every drop we drink, every breath we take, we are connected to the sea no matter where we live. Most of the oxygen in the atmosphere is generated by the sea. Over time, most of the planets’ organic carbon has been absorbed and stored there. The ocean drives weather, stabilizes temperature, shapes earth’s chemistry, and much more.
We should be thinking of the real cost. For every pound that goes to the market, more than 10 pounds — even 100 pounds— may be thrown away as bycatch. This is the consequence of not knowing that there are limits of what we can take out of the sea.
There are more than 4,000 places in the seas around the world that have protection. The bad news is, you have to look hard to find these places on Google Earth. Protected areas do rebound, but they take time to restore.
We need new ways to generate power. We need new and better ways to cope with poverty, wars, and diseases. We need many things in order to keep and maintain the world as a better place, but nothing else will matter if we fail to protect the ocean. Our fate and the ocean are one.