The flooding was largely due to local farmers blowing up dikes and dams after Hussein's regime ended, and by early 2004, nearly 20% of the drained marshes had been restored. Unfortunately this rapid and uncoordinated flooding has been leeching chemicals into the marshes, causing further damage.
Unfortunately, Iraq is currently in a state where conservation is not a top priority, and the region is suffering because of it, the same was true of the oil fires started by retreating soldiers. War is bad news for eveyone, human or otherwise. ::RedOrbit