Cleaning Up the Rivers

Later this month long-distance swimmers will participate in the 20th annual swim around Manhattan sponsored by the Manhattan Island Foundation. Just a few years ago swimming or even boating in the Hudson and East Rivers would have been unthinkable to most New Yorkers. The rivers were just too polluted. But as the waterways have become cleaner they are being reclaimed for recreational use.Today, as part of our week-long series on New York's waterfront, John Rudolph looks at the long struggle to clean up New York harbor.