The State That's Sinking Into the Sea

Louisiana loses approximately 25 to 35 square miles of land to coastal erosion every year, the fastest rate of land loss of any region in North America. The causes are a combination of levee construction that stopped the Mississippi River from depositing new sediment, the extraction of oil and gas which causes underground subsidence, and rising sea levels. At the current rate, the boot-shaped outline of Louisiana visible on maps will look noticeably different within a generation. New Orleans itself sits an average of six feet below sea level.

Source: Wikipedia