Challenging the widely held view that levees and hurricanes are two of the biggest perpetrators in the ongoing demise of Louisiana's coast, researchers from Louisiana State University say the millions of tons of sand and silt swept in by Hurricanes Katrina and Rita prove that major storms actually help wetlands. Their conclusions, reported in today's edition of the journal Science and based on sediment measurements taken after the storms, call into question the entire foundation of Louisiana's sweeping coastal restoration program. That effort has been driven by the assumption that levees along the Mississippi River starved the coast of vital...