Biofuels have been touted as the best hope for reducing reliance on fossil fuels and limiting greenhouse gases. Now many scientists are raising doubts about that. Reporter Kathleen Schalch examines the debate over the costs and benefits of biofuels.
There were celebrations throughout Baghdad and other Iraqi cities today as American forces officially handed over control to Iraqi security forces. Anchor Lisa Mullins finds out what's happening from Sahar Issa.