New publication by Eric Post, Richard B. Alley, Torben R. Christensen, Marc Macias-Fauria, Bruce C. Forbes, Michael N. Gooseff, Amy Iler, Jeffrey T. Kerby, Kristin L. Laidre, Michael E. Mann, Johan Olofsson, Julienne C. Stroeve, Fran Ulmer, Ross A. Virginia and Muyin Wang