Sparks from forestry machinery: A possible or impossible source of forest fires?

Sparks from forestry machinery: A possible or impossible source of forest fires?

Sparks from the contact between metal and stone have been debated extensively in recent years, both in and outside the scientific sphere, especially in forestry due to the fact that many of the major forest fires in Sweden are considered to have started from forestry machines at work. Exactly how this happened, however, is still debated.