The Svínafellsjökull glacier in Iceland. Glacial retreat is among the most visible impacts of climate change. Since the early 20th century, with few exceptions, glaciers around the world have been retreating at unprecedented rates.
Marie Cusick / StateImpact Pennsylvania

This story originally appeared on PBS Newshour and is republished here as part of Covering Climate Now, a global journalistic collaboration to strengthen coverage of the climate story.














