Nearly four decades of Landsat imagery have allowed researchers to closely monitor the retreat, and advance, of some of Kenai Fjords National Park's glaciers. The study didn't pinpoint the exact cause of the glaciers' movements, but rather documented for the National Park Service the behavior of 19 glaciers in the park located about two hours southwest of Anchorage, Alaska.

Plastics -- everything from plastic bottles and bags to food containers -- are washing ashore at national seashores, where crews work throughout the year to remove the garbage that is not just unsightly but a threat to marine and terrestrial wildlife.

An aggressive black bear that didn't flee when rangers tried to haze it was put down at Kenai Fjords Natinoal Park in the Exit Glacier area of the park.