The scale of the disaster in the Himalayas is becoming clearer a day after catastrophic flooding tore through parts of Nepal and Tibet. Scientists believe the disaster was likely triggered by the collapse of a glacier, unleashing a torrent of water, mud and debris that swept away entire communities. Geoff Bennett discussed more with Dan Shugar of the waterSHED Lab at the University of Calgary.

Craig Fugate led the Federal Emergency Management Agency during the Obama administration through record-breaking disaster years. On our PBS News podcast, "Settle In," Amna Nawaz spoke with Fugate about how climate change has upended disaster response, and about criticism that the agency has been politicized in recent years.

The deadly flash flood in Nepal on Wednesday was likely caused by a huge chunk of a glacier that broke off and temporarily dammed a river, according to preliminary investigations by scientists.