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Why didn’t wildfires burn down entire forests in the US when we now have a lot of trouble dealing with them despite having better equipment?

Dr. Aris Thorne
Dr. Aris Thorne
Senior Science Editor · Mar 16, 2026 · Updated Apr 13, 2026

Wildfires used to be more common, but not nearly as intense. Forests were not as dense, and underbrush was not as thick (due to the more frequent fires). Now, once we got to a point where humans started stopping forest fires as soon as they started, the forest began to see fewer fires which would…

142
Words

1 min
Read Time

#45
of 500 in Nature

+100%
vs Category Avg

The Short Answer

Wildfires used to be more common, but not nearly as intense. Forests were not as dense, and underbrush was not as thick (due to the more frequent fires). Now, once we got to a point where humans started stopping forest fires as soon as they started, the forest began to see fewer fires which would lead to a buildup of undergrowth, and increased tree density. Then, when a real good fire started it would have a tremendous amount of fuel, and a clear path to the horizon. This is what leads to modern day firestorms like we see every year. That's why progressive prescribed burns that burn undergrowth every so often are becoming more and more important. We shouldn't stop every little fire that we encounter. We need to let them burn to a certain extent, to keep things balanced and self-containing.

Analysis

Key Concepts: Fires, started, every

This explanation focuses on fires, started, every and spans 142 words across 8 sentences. At 100% above the average Nature explanation (71 words), this is one of the more thorough answers in this category, reflecting the complexity of the underlying question.

What This Answer Covers

The explanation opens with: “Wildfires used to be more common, but not nearly as intense.” It then elaborates by presenting a contrasting perspective, ultimately building toward a complete picture across 8 connected points.

How This Compares in Nature

Ranked #45 of 500 Nature questions by answer depth (top 10%). This places it in the comprehensive tier — the top quarter of most thoroughly answered questions. Questions at this depth typically involve multi-faceted topics requiring nuanced explanation.

Frequently Asked Questions

Is there a simple explanation for why why didn't wildfires burn down entire forests in the us when we now have a lot of trouble dealing with them despite having better equipment?

Wildfires used to be more common, but not nearly as intense. Forests were not as dense, and underbrush was not as thick (due to the more frequent fires). Now, once we got to a point where humans started stopping forest fires as soon as they started,…

How detailed is this explanation compared to similar Nature questions?

This is one of the most thorough answer at 142 words, ranked #45 of 500 Nature questions by depth. The key concepts covered are fires, started, every.

What approach does this answer take to explain why didn't wildfires burn down entire forests in the us when?

The explanation uses contrasting perspectives across 142 words. It is categorized under Nature and addresses the question through 1 analytical lens.