For a value of “break into flames” that matches damp and poorly-oxygenated fuel, yep! This case in Australia is illustrative; you tend to get a lot of nasty smoke rather than a nice campfire vibe.
You’d have to mismanage a household-scale compost pile very badly before it spontaneously combusts, but it’s a known and common failure mode for commercial-scale operations above a few tons. Specific details about when depend a great deal on the composition of the pile; with nitrate filmstock it was possible with as little as a few grams.
For a value of “break into flames” that matches damp and poorly-oxygenated fuel, yep! This case in Australia is illustrative; you tend to get a lot of nasty smoke rather than a nice campfire vibe.
You’d have to mismanage a household-scale compost pile very badly before it spontaneously combusts, but it’s a known and common failure mode for commercial-scale operations above a few tons. Specific details about when depend a great deal on the composition of the pile; with nitrate filmstock it was possible with as little as a few grams.