Rising levels of carbon dioxide make oceans more acidic, putting shellfish, corals, and more at risk.

oceanIf the rising level of carbon dioxide in the earth’s atmosphere is a slowly ticking time bomb, some scientists say, the CO2 building in seawater is a depth charge about to explode.

The world’s oceans are growing more acidic at an increasing – and some say alarming – rate. More and more environmentalists and scientists are saying it may take a severe lowering of CO2 levels to keep ocean life from facing major disruptions, including possible mass extinctions of species.

Seawater absorbs carbon dioxide from the air. But the huge amounts oceans have taken in since the Industrial Revolution began 250 years ago are beginning to make it more acidic.