magnificent redwoods. now they're fighting to survive. here's climate specialist and meteorologist jeff berardelli. >> reporter: california's iconic coastal redwoods, some standing since julius caesar ruled rome, are in a fight for their lives, threatened by extreme wildfires made worse by a warming climatee haven't pronounced it yet. >> reporter: as a vegetation wreckage left behind by the august fires. >> it affected the entire tree, right up to the very top. >> reporter: 14,000 lightning 350 california wildfires. one of them consumed most of the 18,000 acres in the big basin redwood preserve, 50 miles south of san francisco. >> there are no records of fires that have been that big in this vicinity.