CBS: New research suggests that U.S. climate change, and the unpredictable temperature swings it can bring, may boost death rates in seniors. "Temperature variability emerges as a key feature in the potential impacts of climate change. The take-home message: Unusual temperature is bad for people's health," said study author Liuhua Shi, a graduate student in the department of environmental health at Harvard's School of Public Health in Boston. Scientists have long been debating the health effects of...