Earth Day 2021 started as a frosty morning at Crooked Creek Lake, but park rangers and volunteers still came for a tree-planting Earth Day event in Ford City, Pennsylvania, April 22, 2021. Approximately 20 volunteers attended the event to plant 200 tree saplings, which included Eastern White Pine and Swamp White Oak, donated by West Penn Power. Crooked Creek is one of 16 flood control reservoirs within the Pittsburgh District of the U.S. Army Corps of Engineers. Several reservoirs and parks throughout the Pittsburgh district celebrated Earth Day by hosting either a volunteer cleanup or tree-planting day. (U.S. Army Corps of Engineers Pittsburgh District photo by Michel Sauret)