The yield on 30-year U.S. Treasury bonds has recently climbed back above five percent. Former U.S. Treasury Secretary Lawrence H. Summers warns that this reflects grave concerns about the government's long-term debt issuance capacity and further exposes the severity of the federal deficit crisis. Summers also sounds the alarm over recent volatility in the U.S. dollar, stressing that the nation's fiscal health must be scrutinized with heightened vigilance.