Compare outputs to previous CARB inventories

[dlebauer]

SOC Stock: 270 MMT SOC

From CARB NWL Inventory 2025

• Top 30 cm of mineral soil contains 245.09 MMT SOC
• drained organic soil contains 24.47 MMT SOC; these are responsible for most CO2 emissions from cropland soils.

CARB Natural and Working Lands Carbon Inventory, 2025 UpdatedMethodsProposal_croplands_2025.pdf

Also:

• SOM should be max ~2% statewide (from CARB scientist; citation needed)

State level cropland N2O fluxes: 6.8 MMT CO2e = 22.8 Gg N₂O yr−1

Scientific Evaluation of Nitrogenous Emissions from Soils
FINAL REPORT California Air Resources Board, Contract No. 23RD017 Soil N SMERP_Final Report_20250527.pdf

Rice Methane Production: ~0.9 MMT CO2e

California Methane Inventory for 2000-2021 — by Sector and Activity
ghg_inventory_sector_sum_2000-21ch4.pdf https://ww2.arb.ca.gov/sites/default/files/2023-12/ghg_inventory_sector_sum_2000-21ch4.pdf