Guest: Dr. Peter Jung, pediatrician, Memorial Hermann Hospital in Houston, Texas

The signs are all around us: salmonella outbreaks; riots over food shortages; fears over mad cow disease; water shortages; skyrocketing global food prices. These are portents for the end of easily accessible food. Paul Roberts, author of "The End of Food" and "The End of Oil" sees the potential cataclysm ahead.

The United Nations has convened a high-level conference of the World Food Program in Rome to discuss the challenges of climate change, bioenergy and food security amid rises prices. Making an appearance is Zimbabwean president Robert Mugabe, whose own country faces an inflation rate of 165,000 percent.