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gotten so bad that it wasn't safe to breathe. so my wife and i took me, the asthmatic, my elderly parent, and our kids straight to vegas. not because we wanted to gamble, but because it was close and there were cheap flights. now back then, it seemed like a oneself-in-a-lifetime thing. >> rescue, what is your emergency? >> reporter: but ever since, the fires in california have gotten worse. >> dixie fire. >> woolsey fire. >> are more towns burned to the ground, more forests devastated and more refugees. this episode is about californians and fire, because we got to learn how to get a...

california history. >> agh. lucky for us the fires hadn't made it to where my family lives in oakland, but the air had gotten so bad that it wasn't safe to breathe. so my wife and i took me, the asthmatic, my elderly parent, and our kids straight to vegas. not because we wanted to gamble, but because it was close and there were cheap flights. now back then, it seemed like a oneself-in-a-lifetime thing. >> fire rescue, what is your emergency? >> but ever since, the fires in california have a gotten worse. >> dixie fire. >> woolsey fire. >> are more towns burned to the ground, more for...

california history. >> ahh! lucky for us, the fires hadn't made it to where my family lives in oakland, but the air had gotten so bad that it wasn't safe to breathe. so my wife and i took me, the asthmatic, our elderly parents and kids straight to vegas. not because we wanted to gamble, but because it was close and there were cheap flights. back then, it seemed like a once in a lifetime thing, but every year since, the fires in california have gotten worse. >> the dixie fire. >> the hill fire. >> there are more towns being burned to the ground, more people whose lives are devastated,...

That fire behavior triangle, weather, fuel, topography. on that fire, we had a red flag warning, which means that it's extremely dry out. we had extreme winds, which makes it easier for the fire to move forward. it was in very steep terrain. fire likes to move uphill. and we had just a lot of dead fuels, because of drought. >> are there technologies being worked on or things that you feel hopeful about that we're developing? >> yeah, the wharf-s fire, which is the forecast model we run, takes all of those different factor, the weather, the fuel, the topography, and show you an exact picture of...

Commodity and fire the enemy to be stamped out. then in 1910, wildfires destroyed three million acres across the uswest. so the u.s. forest service made it their policy to put out any fire as soon as it started. as a result, forests became dense and overgrown. there were too many small young trees and dead trees and dry brush accumulated on the floor. add drought and climate change to the mix and you have the perfect kindling for a wildfire. isn't there a part that the wildfires started to do things people hadn't seen them do before? >> yeah. one thing i noticed is how fast the wildfires move....