Residents of storm-wary New Orleans scrambled to flee the city Sunday as Hurricane Gustav barreled toward the Gulf Coast, and police and National Guard troops took to the streets to patrol the city's evacuated neighborhoods.

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In Shishmaref, Alaska -- a 600-person village 20 miles south of the Arctic Circle -- residents are feeling the effects of climate change: earlier sea ice melts and increasing storm surges. Tom Bearden reports on how the residents are coping.

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More than two dozen levees along the Mississippi and its tributaries have broken under heavy flooding, leaving many communities questioning the region's levee system and land usage. Elizabeth Brackett reports from Illinois on the struggle to keep levees standing.

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As the Mississippi River continues to rise through Iowa, Illinois and Missouri, federal officials fear many of the existing levees will fail, stressing the region's flood prevention system. A civil engineer discusses the science of levees.

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Billions of U.S. dollars have been invested in improving Iraq's infrastructure since 2003, but the effort has been beset by problems. Special Inspector General for Iraq Reconstruction Stuart Bowen discusses his latest report.

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The city of New Orleans filed a claim against the Army Corps of Engineers on Thursday, seeking $77 billion for damages sustained when the corps-built levees broke during Hurricane Katrina, flooding 80 percent of the city.

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In the first month of a new hurricane season, the Army Corps of Engineers has completed almost $800 million in repairs to the New Orleans levee system, repairs some say still leave the battered city vulnerable.

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