Join Waleed Abdalati, professor of geography and director of the Cooperative Institute for Research in Environmental Sciences, for a discussion about how ice in the polar regions is changing and its link to climate change. The former NASA chief scientist will share insights on how to create meaningful conversations about difficult, divisive topics, such as climate change. Saturday, Feb. 7, 1-3 p.m., Benson Earth Sciences - Room 180. Part of CU on the Weekend, which is free and open to the public.