darrel mitchell is one of the firefighters. explain what is this is about. >> this is a dirty end of the business we have to clean out the area. or by blocking out this valley we take control of where this fire is going. to the back of these houses rather than running wild. >> its seems counter intuitive to fight fire with fire. water supply is limit the and especially during drought time. you wouldn't have enough water in australia to pour down a mountain side to put out a fire. this is the only efficient and effective way. >> this sun -- this is one of the big fires in new south wales. the hot weather is due to run from sunday. this is really a race against time. >>> coming up in this half hour. we report from a refugee center in germany which is helping the first arrivals from syria. >>> training as a child. setting up shop as a small business owner. columbian rebels are trying to re-enter society. [[voiceover]] every day, events sweep across our country. and with them, a storm of views. how can you fully understand the impa