• In this March 29, 2006 photo, a skier poses for a photograph on Portage Lake in front of Portage Glacier, about 50 miles south of Anchorage, Alaska. The Portage Glacier, which is a major Alaska tourist destination near Anchorage has retreated so far it no longer can be seen from a multimillion-dollar visitors center built in 1986.  President Obama leaves Monday, Aug. 31, 2015 for a three-day visit to the 49th state in which he will speak at a State Department climate change conference and become the first president to visit the Alaska Arctic. There and even in the sub-Arctic part of the state, he will see the damage caused by warming, damage that has been evident to scientists for years. (Evan R. Steinhauser/Anchorage Dispatch News via AP, File)

    Global warming carving changes into Alaska in fire and ice

    ANCHORAGE, Alaska (AP) — Global warming is carving measurable changes into Alaska, and President Barack Obama is about to see it.

  • In this Aug. 7, 2015, photo scientist Oliver Grah measures the velocity of a stream of glacier melt stemming from Sholes Glacier in one of Mount Baker's slopes in Mount Baker, Wash. Glaciers on Mount Baker and other mountains in the North Cascades are thinning and retreating. (AP Photo/Manuel Valdes)

    Scientists, tribe study shrinking Washington state glacier

    MOUNT BAKER, Wash. (AP) — Mauri Pelto digs his crampons into the steep icy slope on Mount Baker in Washington state and watches as streams of water cascade off the thick mass of bare, bluish ice. Every 20 yards, the water carves vertical channels in the face of the glacier as it rushes downstream.