Relationship, requires input

Ammonia requires input Natural gas

The stored status is what a reviewer approved. The level below it is what the overlapping data support; the two are shown side by side and only a human moves the status.

Stored statusEstablished relationEvidence level (latest analysis)not analysed yet

Mechanism, evidence, reviewer judgements

The edge as stored

Ammonia requires input Natural gas2 evidenceEstablished relation

Ammonia depends on Natural gas.

Mechanism

Haber-Bosch synthesis takes hydrogen from steam reforming of natural gas in most plants; gas is both feedstock and fuel. Coal gasification and electrolytic hydrogen are the alternative routes and supply a minority of output.

Evidence

documentIEA, Ammonia Technology Roadmapiea.orgAmmonia production routes: natural gas reforming, coal gasification, electrolysis; fertilizer end use.checked 2026-09-07
documentEIA, Natural gas explained: use of natural gaseia.govIndustrial use of natural gas as fuel and feedstock, including fertilizer.checked 2026-09-07

Status: established_identity_or_engineering_relation
Reviewer confidence: 0.95
Stated strength: 0.80
Lag: not stated
Version: curated_seed_v1
Reviewed: 2026-09-07

Confidence and strength are curated judgements recorded with the edge, not measured quantities.

Entity pages: Ammonia, Natural gas. Part of the mechanism Natural gas prices pass through ammonia into nitrogen fertilizer cost, crop yields and food supply.

Not computed

Statistical evidence

No analysis has been stored for this edge. The causal.analyze_all job runs monthly over every edge with a catalog metric linked to both entities; edges without a series on both ends are not analysed.

Not computed

Causal estimate

A causal estimate needs at least 20 overlapping periods and was not attempted for this edge yet.

What each rung means

Levels

Level 0: No association found
the overlapping data show no significant association.
Level 1: Correlation only
statistically associated in the overlapping periods; no direction, no mechanism.
Level 2: Predictive lead/lag
one series historically contains predictive information about the other.
Level 3: Mechanism supported
a documented physical, economic or institutional mechanism with cited evidence.
Level 4: Causally supported
a backdoor-adjusted estimate that survived refutation, on stated assumptions.
Level 5: Established relation
follows from engineering, accounting or scientific structure.

Every stored run, newest first

Analysis history

No runs stored.