Christian Åslund, a Swedish photojournalist who works with Greenpeace, has made a simple experiment. He took photos of glaciers in Svalbard, Norway from the Norwegian Polar Institute, which were taken almost a century ago and juxtaposed them with his own photos of the same places, which were taken in 2002. He's using the photo series to promote #MyClimateAction, a National Geographic campaign encouraging discussion about climate change, and there could be no better argument in their favor than these comparisons.