This week, Alexandra Cousteau and the crew with Expedition Blue Planet travel to Louisiana to investigate the impact that the loss of wetlands has had on the local communities.

New Orleans is sinking because the wetlands that naturally would form new land have been destroyed for the construction of navigation channels along the Mississippi River. But this is what many coastal areas will look like in 50 to 100 years if global climate change continues at its current rate: abandoned, hopeless, under water.