Wood ignites at temperatures in the hundreds of degrees. How are some wildfires supposedly started by sunlight without human action or lightning?
In: 1508
I dont think it happens solely by sunlight alone. There are likely some human waste products (mirrors, prisms, glass, water bottles, etc) that can absolutely magnify the suns rays, however.
If you are ever on a hike, it doesnt hurt to bring a magnifying glass with you as a fire starter. While the sun alone wont light your tinder, with the help of something that can concentrate and magnify the heat, you can very easily get a fire smoldering.
I would guess that the fires you are referencing were more likely caused by a combination of factors.
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