Teams admit hope is fading for those still missing in wake of Joplin tornado.
There has been a clear shift in Joplin, Missouri.
The overwhelming task of dealing with six miles of debris left behind by Sunday's massive tornado has started.
There is so much twisted metal, splintered wood and shattered glass that teams work in waves.
As the clean-up effort intensifies city leaders stress they have not abandoned the search for survivors.
Search and rescue teams are looking for at least 231 people still missing.