"Think of Mesa Verde National Park and you probably imagine iconic cliff dwellings sketched in sandstone. Those homes were built by the Ancestral Pueblo before they left the area in the late 13th Century.
Climate change may be putting some of those dwellings in jeopardy. The structural integrity of Spruce Tree House, one of the Southwest’s most popular archeological attractions, is a particular worry.
'We’ve had stuff fall off the ledges,' said Mesa Verde Resource Management Chief Scott Travis, pointing to the very top of Spruce Tree House, the park’s third largest cliff dwelling."