20 → 20 million kilograms co2 a year, once grown about 20 kilograms of co2 a year, for decades, once it is grown. about a week of driving.
method per-person, per-year estimate from the cited study (US Forest Service; Bastin et al. 2019 (and its critics)), world-average where the study allows; the million-people column is straight multiplication. 'for scale' divides by 0.8 t CO2e, the meat-free yardstick.
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