The chemical industry has spent $10 billion upgrading safety and anti-terrorism measures at chemical plants in the decade since the 9/11 attacks, even as the federal government has yet to devise a permanent comprehensive program. "The terrorist attacks of Sept. 11, 2001, permanently altered our concept of what it means to feel secure in the modern world," said Cal Dooley, president and CEO of the American Chemistry Council. "I think we've all looked at improving our security systems. I think 9/11 certainly changed the way we all look at our security systems," said DuPont safety and security official Arnie Green.

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