The Restoration Bargain · Episode 13 of 13 · 19 min
The Externality Nobody Counted (bonus)
Only about 22 to 23 percent of a forest's aboveground carbon actually burns, even in high-severity fire, and large conifers' trunks do not combust at all; the trees die standing and release carbon over decades. This bonus episode asks whether the series kept the smaller of two ledgers. The second ledger is smoke, with wildfire PM2.5 carrying large health costs, and it sets out what remains unknown.
Who's who
- John Campbell+2 more episodesBiscuit Fire researcher who measured a zero bole combustion factor
- Beverly Law+1 more episodeOregon State forest scientist on the Biscuit Fire team
- Jeffrey StenzelUniversity of Idaho researcher on western emissions overstatement
- Tara HudiburgUniversity of Idaho co-author of the 2019 combustion study
- Christopher WilliamsClark University co-author of the 2012 fire carbon partition
- Nicholas MullerCarnegie Mellon co-author of the 2025 smoke-damage study
- Laura KielyLead author of a 2024 study on burn-day dispersion and mortality
- Marshall Burke+2 more episodesCo-author on smoke mortality and the social cost of carbon
Where it happens
- Biscuit Fire area, Oregon200,000-hectare fire measured in a 180-plot study
- Western United States+2 more episodesRegion of the 1984-2008 and 2019 emissions studies
- California+30 more episodesSetting of a 2024 prescribed-burn scenario raising emergency visits
Timeline
- 2007Biscuit Fire study measures a large-conifer bole combustion factor of 0.00
- 2012Study partitions western fire carbon into combusted and dead-pool fluxes
- 2019Study finds 23 percent of aboveground stocks combusted
- June 2024EPA publishes benefit-per-ton values for PM2.5 across 21 sectors
- 2025Study puts US fire smoke damages at $200 billion for 2017
- June 11, 2026Science paper finds low-severity fire cuts very-high-severity fire probability 92.4 percent
Still debated
Gross carbon is not net damage, since regrowth repays much of the debt unless a stand converts type. The high-severity smoke figure is extrapolated, acute versus chronic mortality framing swings totals about tenfold, and a dissenting paper argues prescribed fire will not reduce net emissions in most places.
