Old-time oceans became deadly

The oceans have always been crucial to the state of earth's biospere. New research shows that deteriorating ocean conditions long ago may had led to a major extinction of living species. This was long before humans, or coal-burning power plants or corn faming. The finger of fate points to Chlorobium — green sulfur bacteria — that were living in the ancient oceans. They give off hydrogen sulfide and that reduced the levels of life-giving gases in the ocean and atmosphere: CO2 and O2. The relevant lesson for us today: we cannot ignore what's happening in the oceans which domninate our planet. Even those of us who live far from the nearest seashore. There's more at stake than simply the price of orange ruffy at the local eatery.