In Washington, a U.S. defense official said the U.S. Navy will contribute two high-tech acoustic devices to listen for emergency beacons still operating in deep water.

CNN: More bodies found from Air France crash

Treatment continues at the sites today, with vapor barriers in place, so-called slurry walls going down 40 feet into the earth, well sucking up water to be treated, and systems operating to extract toxins from the air and water.

FORBES: Google Buildings Polluted With Toxic Vapors From Chemical Spills

Using less electricity, using less oil or using less water helps keep operating costs lower which allows Wal-Mart to keep prices down.

FORBES: Has Wal-Mart Has Lost Touch With Its Populist Roots?