ERASED FROM THE INTERNET #1: WATER ROOFS
IF this INCREDIBLY SIMPLE idea was wide stream VERY FEW houses would have burned in the fires, and the recent wildfires would not be getting near as big.
WATER ROOFS! What is a "water roof?" It's a flat roof with boarders around the perimeter that hold 5 or 6 inches of water on your roof, thus they have an incredibly hard time catching on fire from the outside. The water can also be used as storage for other needs or usages.