Why don’t we heed seas’ warning signs?

And so we should be. Any other reaction would be a form of denial and very difficult to understand. Anyone who still thinks this is about the survival of fish and crabs rather than humanity is in denial too.
Renton describes vast areas of ocean turned sterile and unproductive — dead zones — because of human behaviour, behaviour that despite all of the grim warnings and grand rhetoric continues unchecked, indeed in some instances accelerates.