American students are going back to school in order to advance their careers in a bad economy, but more education mean more debt. Many students owe tens of thousands of dollars in loans by the time they graduate. The total amount of US student debt is more than a trillion dollars. The weak economy is exacerbating the problem because graduates cannot find jobs and therefore are not able to pay off their loans. Al Jazeera's Kimberly Halkett reports from Washington, DC.