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Carl Casperson of Out on a Limb Tree Service, ducks out of a swinging branch he just cut off in front of Boulder High School.Based on the the advice of two independent tree and landscaping consultants, the Boulder Valley School District and the City of Boulder, directed that two mature silver maple trees be removed from the Boulder High School campus on Friday. The trees were both determined to be dying and were thought to pose a threat to people and property.(Photo by Cliff Grassmick/Digital First Media/Boulder Daily Camera via Getty Images)