There's never a single reason why wildfires escalate and, in the case of Australia, a perfect storm of factors is involved.
The country regularly sees fires but
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they are usually centred on bushland while the current blazes are striking forests, which burn hotter and higher so are harder to tackle.
There's plenty to ignite. A programme to create firebreaks - deliberately clearing vegetation to prevent it from catching fire - has unfolded less quickly than hoped. It's slow, labour-intensive work, and expensive too.
On top of all this, a pattern of unusually
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dry weather over the past three years culminated in the driest spring on record at the end of last year.
That left many areas vulnerable to fire, particularly when 2019 also proved to be Australia's hottest on record - and warmer conditions cause more evaporation, adding to the risk.
All this has sharpened Australia's divisions
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over climate change. A coal-rich economy that depends on fossil fuels faces new questions about its own hand in raising temperatures.