Pittsburgh Tribune-Review: A warmer Earth likely means less flu, but determining just how much less is a “wicked problem,” the dean of the University of Pittsburgh Graduate School of Public Health told a standing room-only crowd of more than 100 people Friday at Science 2008. It was the eighth year for the free symposium that draws scientists and people interested in science. Several experiments and studies conclude that climate change will impact infectious diseases worldwide, said Dr. Donald Burke, but …