How Safe Are America's Natural-Gas Pipelines?

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Last week a natural gas explosion killed at least 4 people, injured many more and destroyed more than 37 homes in a quiet neighborhood of San Bruno, a suburb of San Francisco. Pacific Gas and Electric's 30-inch gas distribution pipe that exploded had been installed underground in 1956, some years before the houses were constructed. PG&E oversees more than 6000 miles of transmission lines in Northern California.




Warren Olney