President Obama continues his trip to the Arctic just weeks after his administration permitted oil giant Shell to begin oil drilling in the remote Arctic waters off the coast of Alaska. On Tuesday, Obama toured a glacier and spoke about the already visible impacts of climate change.

President Obama: “So you guys have been seeing these signs as we’ve walked that mark where the glacier used to be, 1917, 1951. This glacier has lost about a mile and a half over the last couple hundred years, but the pace of the reductions of the glacier are accelerating rapidly each and every year. And this is as good of a sign post of what we’re dealing with when it comes to climate change as just about anything.”

Obama’s remarks come as the environmental group 350.org and the European Green Party launch the “Divest for Paris” challenge, calling on institutions, individuals and governments to divest from fossil fuels ahead of the climate summit in Paris later this year.