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Stephen J. Pyne's new book The Pyrocene: How We Created an Age of Fire, and What Happens Next (U California Press, 2021) tells the story of what happened when a
fire-wielding species, humanity, met an especially fire-receptive time
in Earth's history. Since terrestrial life first appeared, flames have
flourished. Over the past two million years, however, one genus gained
the ability to manipulate fire, swiftly remaking both itself and
eventually the world. We developed small guts and big heads by cooking
food; we climbed the food chain by cooking landscapes; and now we have
become a geologic force by cooking the planet.
Some fire uses
have been direct: fire applied to convert living landscapes into hunting
grounds, forage fields, farms, and pastures. Others have been indirect,
through pyrotechnologies that expanded humanity's reach beyond flame's
grasp. Still, preindustrial and Indigenous societies largely operated
within broad ecological constraints that determined how, and when,
living landscapes could be burned. These ancient relationships between
humans and fire broke down when people began to burn fossil
biomass—lithic landscapes—and humanity’s firepower became unbounded.
Fire-catalyzed climate change globalized the impacts into a new geologic
epoch. The Pleistocene yielded to the Pyrocene.