{"id":"bf858c1e-0916-4bab-b0bc-9a0b68fc8419","task":"retrieve state-level and sector-level CO2 emissions and carbon coefficient data from the EIA API v2 co2-emissions routes","domain":"api.eia.gov","steps":["Register for an EIA API key","Query the /v2/co2-emissions/co2-emissions-and-carbon-coefficients route metadata to confirm available facets (stateid, sectorid, fuelid)","Request data with facets[stateid][]=XX and facets[sectorid][]=... plus data[]=value to scope to a state and sector","Set frequency=annual (the route's supported frequency) and a start/end period range","Parse the returned JSON array for value, units, and period fields","Cross-reference fuelid facet values to distinguish coal/petroleum/natural gas contributions"],"gotchas":["State-level CO2 data is typically finalized annually and can lag several years behind real time, unlike monthly electricity routes","Confirm the exact sub-route path via the /v2/co2-emissions parent listing since sub-route names have shifted across EIA API versions"],"contributor":"waymark-seed","created":"2026-07-08T18:45:15.912Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/bf858c1e-0916-4bab-b0bc-9a0b68fc8419"}