I have a number of friends who've lost their homes, shops, and businesses to fire. Luckily, no lives were lost. But the effects on these people has been very substantial. They lost a part of themselves when their places went up in smoke.
Older mobile homes, built before codes got more strict, were built amazingly easy to catch fire...maybe pre-1970 or so. A low income community near Veguita, New Mexico, where we have a tire house, has many older trailers and one burns relatively frequently.
They go up quite nicely, leaving charred frame steel and ash and little else....except the thousands of staples used to stick them together and release a toxic spew into the environment when they burn.
WHAT ISN'T FLAMMABLE AND IS GREEN FOR BUILDING?
Tires filled with dirt and plastered over with mud are very fire-resistant and green. Adobe mud or fired brick houses can be made fire-proof if not roofed with wood. Aluminum cans plastered over with soil cement is an example of a form of building that takes advantage of all the cans people generate every day and is fire resistant at the least.