HUMANITYVECTOR
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Knowledge graph

How the systems connect

Five curated dependency chains, each drawn as a constrained path from a system people need down to the inputs it rests on. Every link states its mechanism, its evidence and where it sits on the relationship ladder. Nothing here is a measurement; the metrics linked from each node are.

Status, never collapsed

The relationship ladder

A path is never stronger than its weakest edge.
  1. Candidate

    proposed by a person or a model; no mechanism or evidence reviewed yet.

  2. Hypothesized

    a stated mechanism, not yet supported by cited evidence.

  3. Mechanism supported

    a documented physical, economic or institutional mechanism with cited evidence.

  4. Causally supported

    appropriate causal methods or strong external evidence support an effect.

  5. Established relation

    follows from engineering, accounting, contractual or well-established scientific structure.

Established relations follow from engineering or physical structure (copper windings carry the current in a transformer). Mechanism-supported edges describe an economic or agronomic mechanism with cited evidence. No edge in this graph is marked causally supported: that rung waits for a causal study to cite. Candidate and hypothesized edges are shown at their rung so proposals stay visibly proposals.

Constrained paths, expandable branches

Curated chains

5 chains, 34 entities, 37 drawn edges

Curated chain

Electricity, the grid, transformers, copper and aluminum

Delivered electricity rests on the grid, every grid connection passes through transformers, and transformers are wound with copper or aluminum on electrical-steel cores.

Edge statuses presentEstablished relation
Electricity, the grid, transformers, copper and aluminum: dependency path from electricity-system to copperelectricity-system requires input power-grid: Established relationdata-center requires input power-grid: Established relationpower-grid requires input power-transformer: Established relationpower-transformer requires input copper: Established relationpower-transformer requires input aluminum: Established relationpower-transformer requires input electrical-steel: Established relationElectricity systemData centerTransmission anddistribution gridPower transformerRefined copperPrimary aluminumGrain-orientedelectrical steel
  • Candidate
  • Hypothesized
  • Mechanism supported
  • Causally supported
  • Established relation

Edges (6)

Each edge carries its own status, mechanism and evidence. Open an edge to read them.

  1. Electricity system requires input Transmission and distribution grid3 evidenceEstablished relation

    Electricity system depends on Transmission and distribution grid.

    Mechanism

    Electricity is generated in one place and used in another. Delivering it to homes and industry physically requires transmission lines, substations and distribution networks; access statistics count connections to that network.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.99
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  2. Data center requires input Transmission and distribution grid2 evidenceEstablished relation

    Data center depends on Transmission and distribution grid.

    Mechanism

    A data center draws tens to hundreds of megawatts continuously and operates only once connected to the grid at that capacity, so siting and energization follow interconnection.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.98
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  3. Transmission and distribution grid requires input Power transformer2 evidenceEstablished relation

    Transmission and distribution grid depends on Power transformer.

    Mechanism

    Power is transmitted at high voltage to limit losses and stepped down for distribution. Every generator connection, substation and distribution feeder passes through transformers, so grid expansion and interconnection queues move with transformer supply and lead times.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.99
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  4. Power transformer requires input Refined copper3 evidenceEstablished relation

    Power transformer depends on Refined copper.

    Mechanism

    Transformer windings are conductors carrying the full load current. Copper is the standard winding material for its conductivity and mechanical strength; aluminum windings are used in many distribution transformers at a larger cross-section.

    Evidence

    Substitutes for Refined copper

    • aluminum Aluminum windings, larger cross-section for the same current; common in distribution transformers.
    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.

  5. Power transformer requires input Primary aluminum2 evidenceEstablished relation

    Power transformer depends on Primary aluminum.

    Mechanism

    Aluminum is the alternative winding conductor and is used in tank and structural parts; it is lighter and cheaper per unit of conductance but needs more volume.

    Evidence

    Substitutes for Primary aluminum

    • copper Copper windings where space and strength matter.
    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.90
    Stated strength
    0.40
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  6. Power transformer requires input Grain-oriented electrical steel2 evidenceEstablished relation

    Power transformer depends on Grain-oriented electrical steel.

    Mechanism

    Transformer cores are stacked laminations of grain-oriented electrical steel chosen for low core loss. Amorphous alloy cores are a partial alternative in distribution units; there is no drop-in core material for large power transformers.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.95
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

Branches beyond this chain (5)

Other stored dependencies touching these entities. They are not part of the curated path above.

  • Electricity system

    • Semiconductor fabrication plant requires input Electricity system2 evidenceEstablished relation

      Semiconductor fabrication plant depends on Electricity system.

      Mechanism

      Fabs run cleanrooms, tools and chillers continuously and are among the most electricity-intensive industrial facilities.

      Evidence

      Status
      established_identity_or_engineering_relation
      Reviewer confidence
      0.98
      Stated strength
      0.90
      Lag
      not stated
      Version
      curated_seed_v1
      Reviewed
      2026-09-07

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

    • Electricity system enables Economic output2 evidenceHypothesized

      Economic output depends on Electricity system.

      Mechanism

      Stated, not yet evidenced here: electricity access allows productive uses (lighting, machinery, refrigeration, communications) that raise output per person. The catalog carries both series; no causal study is attached.

      Status
      hypothesized
      Reviewer confidence
      0.60
      Stated strength
      not stated
      Lag
      not stated
      Version
      curated_seed_v1
      Reviewed
      2026-09-07

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

    • Electricity system enables Human health and longevity2 evidenceHypothesized

      Human health and longevity depends on Electricity system.

      Mechanism

      Stated, not yet evidenced here: electricity access allows refrigeration of vaccines and food, lighting in clinics, water pumping and a shift away from solid cooking fuels, all of which bear on mortality. The catalog carries both series; no study is attached.

      Status
      hypothesized
      Reviewer confidence
      0.60
      Stated strength
      not stated
      Lag
      not stated
      Version
      curated_seed_v1
      Reviewed
      2026-09-07

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

  • Data center

  • Refined copper

    • Residential construction requires input Refined copper1 evidenceEstablished relation

      Residential construction depends on Refined copper.

      Mechanism

      Building wiring and much plumbing use copper; USGS reports building construction as the largest copper end use in the United States. Aluminum wiring at a larger gauge is the conductor substitute.

      Evidence

      • documentUSGS, Copper statistics and informationusgs.govEnd uses (building construction, electrical and electronic products) and substitutes (aluminum in power cables and some transformer windings).checked 2026-09-07

      Substitutes for Refined copper

      • aluminum Aluminum branch wiring and service entrance cable at a larger gauge.
      Status
      established_identity_or_engineering_relation
      Reviewer confidence
      0.90
      Stated strength
      0.50
      Lag
      not stated
      Version
      curated_seed_v1
      Reviewed
      2026-09-07

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

Curated chain

AI compute, accelerators, memory, fabs, power and water

AI compute is accelerators in data centers; accelerators need high bandwidth memory and leading-edge fabs; fabs need electricity, process water and lithography tools.

Edge statuses presentEstablished relation
AI compute, accelerators, memory, fabs, power and water: dependency path from ai-compute to electricity-systemai-compute requires input ai-accelerator: Established relationai-compute requires input data-center: Established relationai-accelerator requires input high-bandwidth-memory: Established relationai-accelerator requires input semiconductor-fab: Established relationhigh-bandwidth-memory requires input semiconductor-fab: Established relationdata-center requires input power-grid: Established relationsemiconductor-fab requires input electricity-system: Established relationsemiconductor-fab requires input industrial-water: Established relationsemiconductor-fab requires input lithography-tools: Established relationAI computeAI acceleratorData centerHigh bandwidth memorySemiconductorfabrication plantTransmission anddistribution gridElectricity systemIndustrial processwaterLithography tools
  • Candidate
  • Hypothesized
  • Mechanism supported
  • Causally supported
  • Established relation

Edges (9)

Each edge carries its own status, mechanism and evidence. Open an edge to read them.

  1. AI compute requires input AI accelerator1 evidenceEstablished relation

    AI compute depends on AI accelerator.

    Mechanism

    Training and serving large models runs on accelerators. Compute capacity is the number of accelerators installed times their throughput.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.99
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  2. AI compute requires input Data center2 evidenceEstablished relation

    AI compute depends on Data center.

    Mechanism

    Accelerators run in racks that need power, cooling and network at data-center scale.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.99
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  3. AI accelerator requires input High bandwidth memory1 evidenceEstablished relation

    AI accelerator depends on High bandwidth memory.

    Mechanism

    Current accelerators are packaged with stacks of high bandwidth memory beside the logic die to feed it at the bandwidth large models need; the JEDEC standard defines that interface.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.95
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  4. AI accelerator requires input Semiconductor fabrication plant2 evidenceEstablished relation

    AI accelerator depends on Semiconductor fabrication plant.

    Mechanism

    The logic die is manufactured on leading-edge process nodes in a small number of fabs.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.99
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  5. High bandwidth memory requires input Semiconductor fabrication plant2 evidenceEstablished relation

    High bandwidth memory depends on Semiconductor fabrication plant.

    Mechanism

    HBM stacks are DRAM dies made in memory fabs, thinned and bonded through-silicon vias.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.98
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  6. Data center requires input Transmission and distribution grid2 evidenceEstablished relation

    Data center depends on Transmission and distribution grid.

    Mechanism

    A data center draws tens to hundreds of megawatts continuously and operates only once connected to the grid at that capacity, so siting and energization follow interconnection.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.98
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  7. Semiconductor fabrication plant requires input Electricity system2 evidenceEstablished relation

    Semiconductor fabrication plant depends on Electricity system.

    Mechanism

    Fabs run cleanrooms, tools and chillers continuously and are among the most electricity-intensive industrial facilities.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.98
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  8. Semiconductor fabrication plant requires input Industrial process water2 evidenceEstablished relation

    Semiconductor fabrication plant depends on Industrial process water.

    Mechanism

    Wafer processing rinses with ultrapure water between steps; a fab uses millions of gallons a day. Recycling reduces intake but not the need.

    Evidence

    • documentUSGS, Industrial water useusgs.govIndustrial withdrawals for processing, washing, diluting and cooling, including semiconductor manufacturing.checked 2026-09-07
    • documentNIST, CHIPS for Americanist.govFab construction, supply chain and workforce programme.checked 2026-09-07
    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.95
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  9. Semiconductor fabrication plant requires input Lithography tools2 evidenceEstablished relation

    Semiconductor fabrication plant depends on Lithography tools.

    Mechanism

    Patterning at leading-edge nodes uses extreme ultraviolet scanners from a single supplier; fab capacity is bounded by tool deliveries.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.98
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

Branches beyond this chain (6)

Other stored dependencies touching these entities. They are not part of the curated path above.

Curated chain

Housing, construction labor, lumber, cement, copper and financing

Homes come from residential construction, which needs trades on site, lumber, cement and copper, and credit whose cost follows the policy rate.

Edge statuses presentEstablished relationMechanism supported
Housing, construction labor, lumber, cement, copper and financing: dependency path from housing to policy-interest-ratehousing requires input residential-construction: Established relationresidential-construction requires input construction-labor: Established relationresidential-construction requires input lumber: Mechanism supportedresidential-construction requires input cement: Established relationresidential-construction requires input copper: Established relationresidential-construction requires input construction-financing: Mechanism supportedconstruction-financing depends on policy-interest-rate: Mechanism supportedHousing stockResidentialconstructionConstruction laborSoftwood lumberCementRefined copperConstruction andmortgage financingPolicy interest rate
  • Candidate
  • Hypothesized
  • Mechanism supported
  • Causally supported
  • Established relation

Edges (7)

Each edge carries its own status, mechanism and evidence. Open an edge to read them.

  1. Housing stock requires input Residential construction2 evidenceEstablished relation

    Housing stock depends on Residential construction.

    Mechanism

    Additions to the housing stock are completed residential construction net of demolitions; there is no other way to add dwellings.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.99
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  2. Residential construction requires input Construction labor2 evidenceEstablished relation

    Residential construction depends on Construction labor.

    Mechanism

    Building is labor intensive on site: framing, electrical, plumbing and finishing are done by trades. Employment in residential building moves with starts.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.97
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  3. Residential construction requires input Softwood lumber2 evidenceMechanism supported

    Residential construction depends on Softwood lumber.

    Mechanism

    Most new single-family homes in the United States are wood-framed, so lumber demand tracks starts. Steel framing and masonry substitute in some markets, which is why this is a market mechanism rather than a universal engineering requirement.

    Evidence

    Status
    mechanism_supported
    Reviewer confidence
    0.90
    Stated strength
    0.60
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  4. Residential construction requires input Cement2 evidenceEstablished relation

    Residential construction depends on Cement.

    Mechanism

    Foundations, slabs and footings are concrete, and cement is the binder in concrete with no substitute at scale.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.95
    Stated strength
    0.70
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  5. Residential construction requires input Refined copper1 evidenceEstablished relation

    Residential construction depends on Refined copper.

    Mechanism

    Building wiring and much plumbing use copper; USGS reports building construction as the largest copper end use in the United States. Aluminum wiring at a larger gauge is the conductor substitute.

    Evidence

    • documentUSGS, Copper statistics and informationusgs.govEnd uses (building construction, electrical and electronic products) and substitutes (aluminum in power cables and some transformer windings).checked 2026-09-07

    Substitutes for Refined copper

    • aluminum Aluminum branch wiring and service entrance cable at a larger gauge.
    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.90
    Stated strength
    0.50
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  6. Residential construction requires input Construction and mortgage financing3 evidenceMechanism supported

    Residential construction depends on Construction and mortgage financing.

    Mechanism

    Builders borrow to acquire land and build; buyers borrow to purchase. Credit availability and its cost change how many projects start and how many homes sell.

    Evidence

    Status
    mechanism_supported
    Reviewer confidence
    0.90
    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.

  7. Construction and mortgage financing depends on Policy interest rate2 evidenceMechanism supported

    Construction and mortgage financing depends on Policy interest rate.

    Mechanism

    The policy rate anchors short-term funding costs, and mortgage and construction loan rates move with expectations of it. Higher rates raise monthly payments and lower project returns, which reduces affordability and starts with a lag.

    Evidence

    Status
    mechanism_supported
    Reviewer confidence
    0.85
    Stated strength
    0.70
    Lag
    30 to 540 days
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

Branches beyond this chain (1)

Other stored dependencies touching these entities. They are not part of the curated path above.

  • Refined copper

    • Power transformer requires input Refined copper3 evidenceEstablished relation

      Power transformer depends on Refined copper.

      Mechanism

      Transformer windings are conductors carrying the full load current. Copper is the standard winding material for its conductivity and mechanical strength; aluminum windings are used in many distribution transformers at a larger cross-section.

      Evidence

      Substitutes for Refined copper

      • aluminum Aluminum windings, larger cross-section for the same current; common in distribution transformers.
      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.

Curated chain

Food, fertilizer, natural gas, minerals and transport

Food comes from crops, crop yields lean on fertilizer, nitrogen fertilizer is made from ammonia synthesised from natural gas, phosphate and potash are mined, and freight moves all of it.

Edge statuses presentEstablished relationMechanism supported
Food, fertilizer, natural gas, minerals and transport: dependency path from food-system to natural-gasfood-system requires input crop-production: Established relationcrop-production requires input fertilizer: Mechanism supportedfertilizer requires input ammonia: Established relationfertilizer requires input phosphate-rock: Established relationfertilizer requires input potash: Established relationfertilizer requires input freight-transport: Established relationfood-system requires input freight-transport: Established relationammonia requires input natural-gas: Established relationFood systemCrop productionSynthetic fertilizerAmmoniaPhosphate rockPotashFreight transportNatural gas
  • Candidate
  • Hypothesized
  • Mechanism supported
  • Causally supported
  • Established relation

Edges (8)

Each edge carries its own status, mechanism and evidence. Open an edge to read them.

  1. Food system requires input Crop production3 evidenceEstablished relation

    Food system depends on Crop production.

    Mechanism

    Cereals, oilseeds, fruit and vegetables come from crop production directly and, through animal feed, indirectly.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.99
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  2. Crop production requires input Synthetic fertilizer3 evidenceMechanism supported

    Crop production depends on Synthetic fertilizer.

    Mechanism

    Yields depend on nitrogen, phosphorus and potassium supply, and synthetic fertilizer provides most of it on intensively farmed land. Manure, legume rotation and residue return substitute in part, and the response varies by soil and crop, so this is an agronomic mechanism rather than a fixed coefficient.

    Evidence

    Status
    mechanism_supported
    Reviewer confidence
    0.90
    Stated strength
    0.70
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  3. Synthetic fertilizer requires input Ammonia2 evidenceEstablished relation

    Synthetic fertilizer depends on Ammonia.

    Mechanism

    Nitrogen fertilizers (urea, ammonium nitrate, UAN) are made from ammonia.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.98
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  4. Synthetic fertilizer requires input Phosphate rock2 evidenceEstablished relation

    Synthetic fertilizer depends on Phosphate rock.

    Mechanism

    Phosphate fertilizers are made from mined phosphate rock; there is no synthetic route to phosphorus.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.97
    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.

  5. Synthetic fertilizer requires input Potash2 evidenceEstablished relation

    Synthetic fertilizer depends on Potash.

    Mechanism

    Potassium fertilizer is mined potash; production is concentrated in a few countries.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.97
    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.

  6. Synthetic fertilizer requires input Freight transport2 evidenceEstablished relation

    Synthetic fertilizer depends on Freight transport.

    Mechanism

    Fertilizer is bulky and largely imported into consuming regions; rail, barge and ocean freight deliver it inside the planting window.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.90
    Stated strength
    0.70
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  7. Food system requires input Freight transport2 evidenceEstablished relation

    Food system depends on Freight transport.

    Mechanism

    Food moves from farm to processor to store by truck, rail and ship; without freight the supply chain stops at the farm gate.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.95
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  8. 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

    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.

Curated chain

Space launch, launch vehicles, engines, materials and manufacturing

Launch capacity is vehicles times cadence; vehicles need engines, alloys and propellant; engines and structures come out of precision manufacturing.

Edge statuses presentEstablished relation
Space launch, launch vehicles, engines, materials and manufacturing: dependency path from space-launch to precision-manufacturingspace-launch requires input launch-vehicle: Established relationlaunch-vehicle requires input rocket-engine: Established relationlaunch-vehicle requires input aerospace-alloys: Established relationlaunch-vehicle requires input propellant: Established relationrocket-engine requires input aerospace-alloys: Established relationrocket-engine requires input precision-manufacturing: Established relationlaunch-vehicle requires input precision-manufacturing: Established relationSpace launch capacityLaunch vehicleRocket engineAerospace alloysRocket propellantPrecisionmanufacturing
  • Candidate
  • Hypothesized
  • Mechanism supported
  • Causally supported
  • Established relation

Edges (7)

Each edge carries its own status, mechanism and evidence. Open an edge to read them.

  1. Space launch capacity requires input Launch vehicle2 evidenceEstablished relation

    Space launch capacity depends on Launch vehicle.

    Mechanism

    Every orbital launch flies a licensed launch vehicle; capacity is vehicles available times cadence.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.99
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  2. Launch vehicle requires input Rocket engine2 evidenceEstablished relation

    Launch vehicle depends on Rocket engine.

    Mechanism

    Thrust comes from the engines on each stage; a vehicle cannot fly without its full engine set.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.99
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  3. Launch vehicle requires input Aerospace alloys2 evidenceEstablished relation

    Launch vehicle depends on Aerospace alloys.

    Mechanism

    Tanks and structures are aluminum-lithium alloy, stainless steel or composites chosen for strength at low mass.

    Evidence

    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.

  4. Launch vehicle requires input Rocket propellant2 evidenceEstablished relation

    Launch vehicle depends on Rocket propellant.

    Mechanism

    Thrust is propellant mass flow times exhaust velocity; the vehicle is mostly propellant by mass at liftoff.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.98
    Stated strength
    1.00
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  5. Rocket engine requires input Aerospace alloys1 evidenceEstablished relation

    Rocket engine depends on Aerospace alloys.

    Mechanism

    Combustion chambers, turbopumps and nozzles operate at extreme temperature and pressure and are built from nickel superalloys and copper alloys.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.95
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  6. Rocket engine requires input Precision manufacturing2 evidenceEstablished relation

    Rocket engine depends on Precision manufacturing.

    Mechanism

    Engines are machined, welded and increasingly printed to tight tolerances; engine production rate bounds vehicle production.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.95
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

  7. Launch vehicle requires input Precision manufacturing1 evidenceEstablished relation

    Launch vehicle depends on Precision manufacturing.

    Mechanism

    Tanks, domes and structures are formed, friction-stir welded and inspected in aerospace manufacturing plants.

    Evidence

    Status
    established_identity_or_engineering_relation
    Reviewer confidence
    0.95
    Stated strength
    0.90
    Lag
    not stated
    Version
    curated_seed_v1
    Reviewed
    2026-09-07

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

Branches beyond this chain (1)

Other stored dependencies touching these entities. They are not part of the curated path above.

Node pages: every entity in a chain has a page at /why/<entity> listing what depends on it, what it depends on, its substitutes and the catalog metrics that measure it.