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It’s as though, having all but exterminated a plague, we decided we no longer needed to keep up the pyric hygiene that contained it.

Widen the aperture a bit, and we can envision Earth entering a fire age comparable to the ice ages of the Pleistocene, complete with the pyric equivalent of ice sheets, pluvial lakes, periglacial outwash plains, mass extinctions, and sea level changes.

That set into motion a “pyric transition” that resembles the demographic transition which accompanies industrialization as human populations first expand, then recede.

When humans began to burn fossilized rather than living biomass, it set in motion a "pyric transition," he writes.

The historian Stephen Pyne calls this the "pyric transition".