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					Originally Posted by katiesue  Wern't large portions of California originally desert to start with?  So we've artifically created the problem in building where conditions like this occur. | 
	
 Not so much desert, but chaparral, a type of landscape predicated on a grow-and-burn cycle.  Not a big issue when people were inhabiting the largely marshy flatlands of the valleys and basins, but a huge issue as the sprawl has  backed up against the brushy mountains.