Here is where I get to tell you about mine. The need for change comes from many sources. By environmental, I am not talking here on the theory of global warming. These 'fires' leave shaken, bitter, but hopefully wiser people to deal with the aftermath and clean up. Fires force changes.
Witch Wars force internal changes by breaking up old allegiances and formulating new ones.
They force external changes in the community by bringing hidden issues out into the open. They begin to smolder where there is need for change. They finally burst into flame where that need is ignored. Change will come when the time for it is right. It may come through planning and foresight.