



Earlier this year at the Telluride Mountainfilm Festival, the artist Justin Brice Guariglia fell into conversation with a stranger.

“I got stuck on a gondola ride with a climate change denier,” Mr. Guariglia said recently. The stranger clearly had no idea who he was dealing with.

Not only had Mr. Guariglia previously talked his way into joining a NASA scientific mission over Greenland so that he could photograph melting polar ice caps. He also had even created a mobile app called After Ice, which allows users to take a selfie that is overlaid with a watery filter indicating the sea level projected in their geo-tagged location in the 2080s.