Aspen Times: Probably no bit of information presented at the Aspen Environment Forum was as sobering as the screening of the film “Extreme Ice” at the Wheeler Opera House Thursday night. The documentary used time-lapse photography to show how the biggest glaciers in the world are disappearing because of global warming. “Seeing is believing” is the motto for the film and for the Extreme Ice Survey, a research project sponsored by National Geographic. Photojournalist James Balog and the …