Oil Tanker in San Francisco Bay

An oil tanker glides under San Francisco's Golden Gate Bridge. It is one of many ships in this busy port carrying, on the average a million gallons of water in ballast tanks, for stability in open waters. Large ships often carry 20 million gallons. In the past, water take up in a distant port was released here, devastating the <br />
ecosystem. California attempts to regulate the practice but it is still common here and in <br />
ports the world over,

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