New study finds controlled fires increase survival rate for giant sequoia treesA new study found prescribed burns highly increase the survival rate of giant sequoia trees from two recent California wildfires. A new study found prescribed burns highly increase the survival rate of giant sequoia trees from two recent California wildfires. A new study found prescribed burns highly increase the survival rate of giant sequoia trees from two recent California wildfires. A new study found prescribed burns highly increase the survival rate of giant sequoia trees from two recent California wildfires. CALIFORNIA (KFSN) -- A new study found prescribed burns highly increase the survival rate of giant sequoia trees from two recent California wildfires.