When two sympatric, closely related species appear to have very similar needs, we may ask whether mechanisms exist that enable them to avoid direct c… - Carl Safina

Most of the oxygen we breathe is made by ocean plankton. And when animals left the seas in which life arose, they took seawater with them, in their bodies — an internal environment crucial for cellular survival. We are, in a sense, soft vessels of seawater.

The bluefin tuna (Thunnus thynnus) is a creature of superlatives. Growing to 1500 pounds (700 kilos), traveling on transoceanic migrations, and reputedly capable of swimming 50 miles (90 km) per hour, it is one of the largest, most wide-ranging, and fastest of animals. To anyone who has seen this saber-finned giant explode through the surface of the sea, it is among the most magnificent.

A couple of years ago I was participating as a writing coach in a "sea-mester," sailing 1,000 miles from Hawaii to , while students from Stanford University received lectures and closely supervised instruction and conducted independent projects on high-tech oceanography. These were smart kids, and the professors were superb. Five hundred miles from land, we got into a discussion on whether the ocean is a "wilderness." The consensus: Obviously it is; there was no sign of humanity, not another boat in sight. Everyone savored the thought: wilderness!
But, I reminded everyone, we haven't caught a single or seen a or a . Wilderness? I don't think so. If the were covered with water, you wouldn't see that the buffalo were gone, either. There is no ocean wilderness. The whole ocean feels our effects, through fishing, pollution, dying s, , immortal plastics, oxygen-asphyxiated s, , and .