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Depends upon where you are and what the weather and fuel conditions are.

For example, in the southwestern part of the USA, an average of 60 to 70 percent of the wildfires are started by lightning.

However, as a global average, only about 8 percent of the wildfires are caused by natural events.

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โˆ™ 2012-06-19 19:22:10
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Q: What percentage of forest fires are started by lightning?
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