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HRB - Hazard Reduction Burn.


Eucalyptus trees are like growing tinder boxes. The leaves and bark that falls from them is designed to dry very quickly and, being rich in oil, act as tinder for a fire. The litter is also high in a chemical that means they are resistant to fungus growth so don't break down easily or dampen when in the ground. In high temperatures the trees themselves, being saturated in highly combustable oil, emit a cloud of extremely volatile vapour and it's mainly the Eucalyptus that causes the devastating fires. They are also known to explode violently during fires.


An HRB is a controlled burn of an area to help prevent bush fires. It's still pretty dangerous and the warning is to prepare people for the smoke as much as anything else.

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