United Press International: A Canadian scientist says those who study climate change must be careful to reduce their own carbon footprints. University of Calgary postdoctoral fellow Ryan Brook is urging scientists to examine and share ways to reduce the impact of working in polar regions. Brook regularly flies north to study the health and anatomy of caribou herds in Nunavut and Northwest Territories. The research typically takes him north five or six times each year and when he calculated his own carbon …