Forests Damaged by Hurricane Katrina Become Major Carbon Source

With the help of NASA Landsat-5 satellite data, a research team has estimated that Hurricane Katrina killed or severely damaged 320 million large trees in Gulf Coast forests, which weakened the role the forests play in storing carbon from the atmosphere. The damage has led to these forests releasing large quantities of carbon dioxide into the atmosphere. 

The full story is available at: http://www.nasa.gov/mission_pages/hurricanes/archives/2007/katrina_carbon.html