Is our ocean turning into a dead zone?

The mighty ocean seems so vast that nothing could destroy it and yet pollution is causing the appearance of numerous oceanic deserts where there is no life. A dead zone the size of mass near Texas is now twice as big as twenty years ago. However, the people is world wide, in the Baltic sea fish are dying due to lack of oxygen. People see that the sea is dying.

Pollution is the problem. The amount of nitrogen runoff did increase and now we face algae blooms that cause mats of green scum to sink to the bottom, rot and consume our oxygen. In the pacific ocean there is so much trash that the pacific gyre is called an oceanfill. That is a landfill, not on land but in the ocean itself.