Credits

• Northern treeline photograph by Terry Chapin, from Land-Atmosphere-Ice Interactions (LAII)
• Permafrost image from National Snow and Ice Data Center
• Surface air temperature trends image from Dr. John Walsh, University of Illinois at Urbana-Champaign
• Arctic sea ice concentration image from National Snow and Ice Data Center

Web page coordination provided by Jim Overland and Nancy Soreide. Tracey Nakamura is responsible for website design and development.