Support WBURA Single Fire Killed Thousands Of Sequoias. Scientists Are Racing To Save The RestPlay04:27Download AudioSeptember 17, 2021Lauren SommerfacebookEmailThe 2020 Castle Fire burned the Alder Creek sequoia grove with extreme intensity, killing many of the 1,000-year-old trees there. Without any green foliage, the trees can't survive or resprout. (NPR)