To all the people that keep bringing up houses burning and not trees.
1) trees and other plants are made up of 50% water.
2) Homes main construction is kiln dried lumber, paint,stain,plastics,etc.
3) homes are filled with flammable furniture,tv's, mattresses, carpet,cleaning supplies,etc.
4) All home roofs must be ventilated, so when a fire heats the air one side of the house(venting) is cooler and the other side of the house (venting) is hotter. This creates a vacuum which in turn sucks in flying embers and hot ashes. Your attic is drier than a dessert, hot embers and and the air being suck through ignite.
5) house burns and the cycle starts at the next house