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The John Batchelor Show

S8 Ep266: THE SCIENCE OF COMBUSTION AND FIRE-ADAPTED VEGETATION Colleague Danielle Clode. The discussion turns to the science of combustion, focusing on fire-adapted vegetation like Eucalyptus and Mountain Ash, which rely on fierce fires and sunlight to regenerate.

The John Batchelor Show

John Batchelor

Books, News, Society & Culture, Arts

4.52.8K Ratings

🗓️ 30 December 2025

⏱️ 9 minutes

🧾️ Download transcript

Summary

THE SCIENCE OF COMBUSTION AND FIRE-ADAPTED VEGETATION Colleague Danielle Clode. The discussion turns to the science of combustion, focusing on fire-adapted vegetation like Eucalyptus and Mountain Ash, which rely on fierce fires and sunlight to regenerate. Clode addresses common misconceptions about ignition, stating that while arson accounts for some fires, natural causes like lightning and accidental faults often produce more dangerous blazes. She also warns that during drought conditions, even plants considered fire-resistant, such as Pittosporum, become fuel, emphasizing the need for managing undergrowth. Finally, Clode outlines the evolution of Australian fire brigades, which began as insurance-run town units before expanding into the massive volunteer networks essential for protecting rural communities. NUMBER 2

Transcript

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0:00.0

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0:27.9

dot I.U. Please gamble responsibly. I'm Tom Batch. With Daniel Kloat. Her book is A Future in Flames, the story of bushfires in Australia,

0:40.8

but the story of bushfires everywhere, if you consider the threat to arable land, to people,

0:47.7

to wildlife, to ecosystems, and yet not a threat, because it, as we've established, it is part of a continent, a part of

0:58.3

nature. We come now to the question of what burns. In my conversation with you about the

1:04.5

koala, I learned that eucalyptus is a torch when it's hit by fire because of the eucalyptus oil and burns very quickly and then blows through.

1:16.2

There's another tree that also you write about the mountain ash.

1:21.6

And that tree, the ash forests of Australia, both the eucalyptus and the Mountain Ash regenerate very quickly. Is that

1:30.2

correct, Danielle? Yeah, so Mountain Ash is a eucalypt as well. It's actually the largest of all the

1:37.0

eucalypts and the largest hardwood in the in the world. It's tall, if not possibly taller in the

1:43.9

past than the redwoods, California.

1:47.9

And the eucalypts are what we call a fire adapted group of plants. So they're drought

1:55.8

adapted and those drought adaptations happen to have made them resilient in the, generally in the face

2:01.9

of fire.

2:02.5

So they regenerate after fire.

2:05.9

There's a lot of deaths, but there's also majority usually survive fires.

2:11.9

Mountain Ash has an interesting history because it actually does die after fire, but it releases

2:17.0

a huge load of sea into the forest.

2:20.2

And it needs a lot of sun to regenerate.

...

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