Environmental Issues
Oceans and Seas

What is the greatest threat to the ocean environment?



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Most pollutants to the ocean environment are local in nature - chemicals and such near-river discharges and oils from shipping lanes. A larger concern is the collection of plastic bits in the large vortexes in several of the oceans. The single greatest impact is the warming of the oceans by climate change. This changes the salinity of the water, the range of the various species of plant and sealife, the creation of corals and sea animal shells, the hunting and breeding of seals and polar bears, the water's oxygen content and the pH of the sea water due to CO2 absorption.