Nature is infinitely more powerful than man. Two modern problems have disrupted natural rhythms:
1. Man’s high-tech interference with the natural course of burns.
2. Man’s expansion into residences in forests.
The two problems are, of course, related.
TC
These facts are all recorded in layers of charcoal that have been dug up and inspected. Here's one of many example studies: http://www.esajournals.org/doi/full/10.1890/060161