The Net Zero Path to 2050 Target

1,000 GW of desert solar plus 40 GW of Alice Hub pumped hydro is the mainstay. The cheap electricity that flows from it retires the domestic transport and electricity sectors, displaces coal-fired generation across the Asia-Pacific via HVDC export, and delivers Australia's 2030, 2035, and 2050 emissions targets.

1. The legislated targets and the current trajectory

The Climate Change Act 2022 enshrines a 43% reduction below 2005 levels by 2030 (target 351 Mt) and net zero by 2050. In September 2025 the government added a 2035 target of 62–70% reduction below 2005 (target 185–234 Mt). The targets are implemented as both absolute single-year figures and as a multi-year emissions budget; the 2021–2030 cumulative budget is 4,381 Mt. Australia's 2005 baseline was 616 Mt. Current emissions are approximately 470 Mt.

The Department of Climate Change, Energy, the Environment and Water (DCCEEW) publishes annual projections. Under the baseline scenario, Australia is projected to reach a 32% reduction by 2030 and a 38% reduction by 2035. Under the with-additional-measures scenario, Australia is projected to reach 40% by 2030 and 48% by 2035. Both scenarios miss the 2030 target. Both miss the 2035 target by a wider margin.

The structural cause is named in the projections themselves: the transport sector, the heavy industry sector, and the agricultural sector lack a credible decarbonisation programme at the scale required. Electricity decarbonisation is achievable on the Rewiring the Nation plus AEMO ISP framework; transport and industrial decarbonisation are the gap. The SBC closes that gap structurally by building the infrastructure that makes electrified freight, cheap-electricity EVs, and industrial process electrification commercially viable rather than subsidy-dependent.

2. The four big domestic retirements the SBC delivers

These are the engineering-defensible domestic retirements. Each is attributable directly to a specific SBC service or to a structural side-effect of the corridor operating. None are offsets. None are international credits.

2.1 Electricity grid — ~140 Mt/yr retired at maturity

Current Australian electricity grid emissions are approximately 150–160 Mt CO₂/yr from coal-fired and gas-fired generation. Current grid emissions intensity is approximately 0.6 kg CO₂/kWh.

The mechanism is the SBC HVDC backbone, integrated into the Phase 0 viaduct structure and extended on the continental corridors. At programme maturity the backbone carries approximately 1,000+ GW of desert solar (gross capacity, ~25% capacity factor) plus 40 GW of pumped hydro from Alice Hub, firming the variability. Coal-fired generation closes commercially as power prices fall below its marginal cost — not by regulation. Gas-fired peaking is retained as transition firming and retires progressively as PHES capacity scales.

Net retirement at maturity: approximately 140 Mt CO₂/yr. Residual: approximately 10–20 Mt from gas peaking and small distributed generation.

2.2 Transport — ~80–100 Mt/yr retired at maturity

Transport emissions are approximately 89 Mt CO₂/yr at present: light vehicles ~69 Mt, heavy road freight ~14 Mt, domestic aviation ~8 Mt. The SBC retires the bulk of all three categories through two structural mechanisms: sub-10c/kWh consumer electricity (which retires light vehicle emissions by price), and continental electric rail and maglev (which retires freight and aviation emissions by capacity).

The light-vehicle EV transition is driven by price, not by subsidy. The SBC's combination of desert solar generation at the lowest LCOE in the developed world, the HVDC backbone that carries it to load centres, and Alice Hub pumped hydro storage that firms the variability, delivers retail electricity to the Australian consumer at under 10c/kWh. At sub-10c/kWh the EV becomes structurally cheaper to run per kilometre than petrol — not by a small margin, but by an order of magnitude. Every household making a vehicle-replacement decision picks the EV on commercial grounds. The transition follows. The full arithmetic — running-cost comparison, fleet emissions per kilometre on different grid mixes, and the case that price beats mandate as a climate policy instrument — is set out in Memo 12 (The Coal Paradox). Light vehicle retirement at maturity: approximately 50–65 Mt CO₂/yr.

Heavy road freight (~14 Mt direct, plus ~25–35 Mt of road freight that should be on rail but is not because rail capacity does not exist) is retired by Phase 0 freight on the east coast and the continental freight corridors on Phases 1, 2, and 3. Total addressable retirement is approximately 25–40 Mt as freight modal shifts from diesel road to electric rail.

Domestic aviation between the east-coast capitals (~5–6 Mt of the 8 Mt total) is retired by the east-coast maglev.

Total transport retirement at maturity: approximately 80–100 Mt CO₂/yr. The retirement is structural — driven by price (EVs) and capacity (freight, maglev) rather than by mandate. Behavioural compliance is not the mechanism; commercial economics is.

2.3 Heavy industry process heat — ~20–30 Mt/yr retired at maturity

Industrial process heat emissions from gas-fired furnaces, kilns, boilers, and steam generation in manufacturing and refining are approximately 35–50 Mt CO₂/yr at present. The retireable share is the lower-temperature process heat that electric alternatives (industrial heat pumps, electric boilers, induction furnaces, electric kilns) can serve.

The SBC's mechanism is the sub-10c/kWh power base that makes industrial electrification commercially viable. The same arithmetic that drives the EV transition makes industrial heat-pump and electric-boiler conversion the cheaper option for the operator — not the regulated option. Additionally, the SBC corridor carries a gas pipeline that links the state gas grids into one national market; combined with a domestic reservation policy this delivers gas at Australian cost-of-production for residual high-temperature processes where electrification is not yet economic, keeping the fertiliser and ammonia industries competitive at home rather than offshoring them.

Net retirement at maturity: approximately 20–30 Mt CO₂/yr.

2.4 Mining and agricultural diesel — ~20–30 Mt/yr retired at maturity

Mining diesel demand in Australia is currently growing at approximately 7.9% per year. Agricultural diesel use is largely flat but substantial. Combined diesel emissions from mining and agriculture are approximately 35–45 Mt CO₂/yr at present.

The mechanism is corridor-enabled electrification. Mining diesel is retired progressively as the heavy-haul rail network reaches mining operations and as electrified mining equipment becomes available on the sub-10c/kWh power base. Agricultural diesel is retired by the agrivoltaic deployment that supplies on-farm electrical power for the equipment transition, and by the cheap-electricity programme that makes electric farm equipment commercially viable.

Net retirement at maturity: approximately 20–30 Mt CO₂/yr.

3. The MMP billion-tree sequestration policy

The MMP platform commits to planting one billion trees over the 25-year build period of the SBC programme, watered by the Sovereign Aqueduct Network.

Australian environmental plantings sequester approximately 6.6–8.6 t CO₂-e per hectare per year at maturity (Meat & Livestock Australia 2023 reference, 770 mm annual rainfall Victorian conditions, 30-year programme average). At a standard environmental planting density of approximately 600 trees per hectare, one billion trees occupies approximately 1.67 million hectares. Total sequestration at maturity: approximately 11–14 Mt CO₂/yr on the MLA reference, scaling to approximately 15–25 Mt CO₂/yr on the higher end depending on species selection (fast-growing eucalypts hit 10–15 t/ha/yr in good conditions), planting density, and water availability.

The Sovereign Aqueduct Network is what makes this biophysically deliverable at scale. 30,000 GL/yr of northern monsoon water transferred south and inland makes biophysically viable an estimated 5–15 million hectares of arid-zone land for sustained vegetation cover; the billion-tree programme uses approximately 1.67 million hectares — a fraction of the available opportunity. The constraint on Australian reforestation at continental scale has never been the desire to plant trees. It has always been water. The aqueduct removes the constraint.

The billion-tree programme is direct physical sequestration in real biomass on real land. It is not a carbon credit scheme, not a paper transaction, and not contingent on international credit market integrity. The MMP position is to commit to a billion as a defensible programme number, not to inflate the figure for headline purposes.

Working figure adopted: ~15–25 Mt CO₂/yr at programme maturity.

4. The international dimension — HVDC displacement

4.1 The mechanism

At programme maturity Australia exports approximately 82.5 GW of continuous renewable electricity to the Asia-Pacific via subsea HVDC interlinks. The destinations are the importing nations whose population centres are within HVDC range of the Australian renewable resource: Indonesia, the Philippines, Vietnam, Malaysia, Singapore, with Japan and South Korea reachable on longer subsea links as the technology matures.

The arithmetic is direct. 82.5 GW continuous at approximately 90% availability is approximately 650 TWh/yr of clean electricity delivered into Asia-Pacific grids. When this electricity arrives in the importing nation's grid, the grid operator dispatches it ahead of its own fossil-fuelled generation, because renewable electricity has near-zero marginal cost and grid operators dispatch by merit order from lowest marginal cost upward. The importing nation's coal-fired and diesel-fired power plants reduce output by the amount of Australian electricity arriving on the interlink. They physically run fewer hours per day. Their fuel consumption falls. Their emissions fall.

This is not a carbon credit transaction. It is a coal plant in Indonesia or a diesel generator in the Philippines that physically does not run for the hours that Australian HVDC is supplying the grid. The coal or diesel that would have been burned is not burned. The CO₂ that would have been emitted is not emitted.

4.2 The arithmetic

The Asia-Pacific grid emissions intensity averages approximately 0.7–0.9 kg CO₂/kWh across the realistic HVDC export destinations. Indonesia, Vietnam, the Philippines, and Malaysia have coal-heavy grids in the 0.8–1.0 kg/kWh range; Singapore (gas-dominated) is at the lower end around 0.4 kg/kWh; Japan and South Korea sit between 0.4–0.5 kg/kWh.

650 TWh/yr of renewable electricity displacing fossil generation at a weighted average of 0.7–0.9 kg CO₂/kWh produces displaced emissions of approximately 455–585 Mt CO₂/yr at programme maturity.

4.3 The credit question — Article 6 of the Paris Agreement

The natural question is whether Australia receives credit for the displaced emissions in importing-nation grids. The current answer is no — Australia's NDC counts domestic emissions only, and the displaced emissions appear in the importing nation's NDC. The MMP position is that the current answer is wrong, and that Australia should negotiate bilaterally to fix it.

The Paris Agreement provides the mechanism. Article 6.2 of the Paris Agreement establishes the framework for “Internationally Transferred Mitigation Outcomes” (ITMOs) — bilateral agreements between countries that allow emissions reductions in one country to be credited toward another country's NDC, with proper accounting to avoid double-counting. Article 6.4 establishes a centralised mechanism (replacing the Clean Development Mechanism) where mitigation projects in one country generate credits that another country can use against its NDC.

Article 6 is the established legal mechanism for exactly this situation: one country invests in an emissions reduction that occurs in another country, and the two countries agree how to share the credit. Switzerland has signed Article 6.2 bilateral agreements with Ghana, Senegal, Vanuatu, and Thailand to fund mitigation projects in those countries and claim a share of the resulting credit against Switzerland's NDC. Japan's Joint Crediting Mechanism (JCM) has signed bilateral agreements with seventeen partner countries.

The MMP position is that Australia should approach the Asia-Pacific importing nations — Indonesia, the Philippines, Vietnam, Malaysia, Singapore, and the larger northern Asian markets — with Article 6 bilateral agreements that recognise the Australian investment behind the displaced emissions while avoiding any double-counting against the importing nation's NDC.

A reasonable starting position for negotiation is a 50/50 split: half of the displaced emissions credit accrues to the importing nation (recognising that the displaced fossil plant is in their grid, on their land, with their employees, and the air-quality benefits accrue locally to their population); half accrues to Australia (recognising the Australian capital investment in the HVDC infrastructure, the desert solar generation, and the Alice Hub PHES firming that make the export possible). Both nations win against their NDC. Neither double-counts. The arithmetic is honest.

At a 50/50 split, Australia's share of the displacement credit at programme maturity is approximately 230–290 Mt CO₂/yr. This would not be added to Australia's 2030 target by mid-2030s; it would be additive to Australia's overshoot of the legislated target, providing a margin against future target tightening and against any failures to deliver on the domestic ledger.

The exact arrangement would be negotiated bilaterally with each importing nation. Smaller, lower-income importing nations could reasonably negotiate a more favourable split for themselves (recognising development priorities and equity considerations); wealthier importing nations could negotiate closer to 50/50 on the engineering merits. The principle is fair credit-sharing for a mutually beneficial outcome — not Australian credit-grabbing, and not Australian unilateral assignment of the displaced emissions to its own ledger.

This is a regional leadership position. It is consistent with the “Australia as uniter of the Asian community of nations” framing of MMA Memo 18. It is consistent with the European-Union model of integrated regional cooperation deep enough to make conflict structurally unattractive. It positions Australia as the partner that delivers the renewable electricity AND negotiates the credit framework AND shares the benefits fairly — not as the partner that extracts the credit unilaterally.

4.4 Why this is not double-counted

The displacement figure is physically counted at the importing nation's grid. The Australian generation is zero-emission (desert solar + PHES firming) and is therefore not in the Australian emissions ledger to subtract from. The displaced fossil generation is in the importing nation's emissions ledger and is the figure that falls. The two physical ledgers are separate and the arithmetic does not overlap.

Under any Article 6 bilateral agreement, the credit-sharing arrangement allocates the same displaced emissions reduction across two NDCs in agreed proportions — but the underlying physical reduction is counted only once. The double-counting concern under Article 6 is real but resolved by the mechanism itself: each agreement requires “corresponding adjustments” in the host nation's NDC accounting to prevent both parties claiming 100% of the same tonne.

4.5 Note on Australia's fossil fuel exports

This memo does not address Australia's separate fossil fuel exports (~1.15 billion tonnes embedded CO₂/yr in coal, LNG, and oil shipped to importing nations and burned there). The question of whether Australian fossil exports continue, decline, or retire is a separate political and commercial question, addressed in a forthcoming MMA memo. The displacement figure in this memo is what the SBC's HVDC interlinks deliver in importing-nation grids; the export question is its own conversation.

5. The residual — named honestly

Combined domestic retirement plus sequestration at programme maturity: approximately 275–325 Mt CO₂/yr. Current domestic emissions: approximately 470 Mt. The domestic residual at maturity is approximately 145–195 Mt, comprising:

Fugitive emissions from legacy fossil fuel operations — methane venting from operating mines, leaks from existing gas pipelines, methane from abandoned wells. Well-capping and mine-vent remediation programmes can halve this over 20–30 years but are separate engineering work the SBC does not directly fund.

Agricultural emissions outside the SBC envelope — the bulk of the agricultural sector's ~75–85 Mt CO₂-e/yr is from sources the SBC does not address. The MMP position is that the agricultural sector's ledger is not the SBC's to balance.

Hard-to-abate industrial process emissions — approximately 15–20 Mt CO₂/yr from cement chemistry (limestone calcination releases CO₂ structurally), blast-furnace steel making, and aluminium smelter carbon anodes. Green steel via hydrogen reduction on Australian hydrogen at ~$1.50/kg becomes commercially viable on the SBC's cheap-electricity base and retires most of the steel emissions over 2035–2045. Green cement and inert-anode aluminium are commercially marginal at present but credible on a 2040–2050 horizon.

The MMP position is to name this residual openly. The SBC plus the billion-tree policy delivers approximately 60% of the legislated 2050 domestic trajectory with infrastructure that can be touched. The remaining 40% is a long-tail engineering problem the SBC's cheap-power-and-cheap-hydrogen base enables but does not by itself complete. The alternative — claiming 100% net zero by 2050 via international carbon credits and offsetting — is dishonest in a way the MMP platform does not endorse.

6. There is no other plan that adds up

The natural objection to this memo is: why is the SBC the answer? Surely some combination of Rewiring the Nation, AEMO ISP transmission upgrades, the New Vehicle Efficiency Standard, the Capacity Investment Scheme, the Safeguard Mechanism, the federal Net Zero Plan, the Future Made in Australia agenda, and the various state renewable energy zones can deliver the trajectory? The honest answer is that they cannot, individually or collectively. The arithmetic does not close.

6.1 The electricity sector is the one piece that almost works — and it is in trouble

Of all the legislated decarbonisation programmes Australia has in flight, the electricity sector is the most credible. Solar and wind are cheap. The Capacity Investment Scheme has expanded twice. The 82% renewable electricity target by 2030 is on the books. But the transmission is failing.

The 2024 AEMO Integrated System Plan requires approximately 4,581 km of new transmission lines by 2030 to meet the renewable energy target. Of the major projects underway:

• HumeLink — the 360 km transmission line connecting Snowy 2.0 to the NSW grid — has had a 190% cost blowout from $1.1B to $3.3B. Construction only commenced in October 2025 after years of community opposition; Transgrid has flagged compulsory acquisition of farmland for landholders who have not agreed easements.
• Marinus Link — the undersea Tasmania–Victoria interconnector — has had a 250% cost blowout from $1.1B to $3.8B.
• Project EnergyConnect — the NSW–SA interconnector — has had an 84% cost blowout from $2.23B to $4.1B.
• VNI West — Victoria–NSW interconnector — remains in pre-construction with ongoing community opposition and route uncertainty.
• NSW LNP opposition announced in November 2025 that if elected they would pause major transmission upgrades — demonstrating the political fragility of the programme across electoral cycles.

The five major transmission projects are running at approximately 140% combined cost overrun, years behind schedule, and politically contested at the community and state-government level. Even the piece of the legislated programme that is most credible is delivering at a fraction of the required pace.

The SBC's HVDC backbone replaces this fragmented project list with a single continental structure. HVDC instead of AC. Elevated viaduct instead of ground-level easement acquisition. Continental scale instead of state-by-state political negotiation. The structure is going there anyway for freight and maglev; the HVDC capacity rides on the same structure at fractional incremental cost.

6.2 There is no plan for continental electric freight

Heavy road freight is approximately 14 Mt CO₂/yr of direct emissions, plus an estimated 25–35 Mt of road freight that should be on rail but is not because rail capacity does not exist. Australia has committed to net zero by 2050. There is currently no federal programme to electrify heavy freight at continental scale.

Inland Rail, the most recent serious attempt at expanding continental freight rail, cancelled its northern half (Toowoomba–Brisbane and Melbourne–Tottenham sections) in 2025. The completed southern segment is diesel-only and runs on a network with chokepoints that have been cut by floods three times in four years (2022, 2024, early 2026). The HSRA programme is passenger-only and runs 191 km of mostly tunnel for $55–90 billion.

Without continental electric rail, heavy freight stays on diesel B-doubles. Heavy freight emissions stay in the ledger. The 14 Mt direct plus the 25–35 Mt that should be on rail compounds at approximately 1–3% per year as freight volumes grow. The 2035 transport-sector target is structurally unreachable without continental electric freight.

6.3 The farmland constraint is binding the current renewable build

The current Australian solar build is being constrained by where it can be physically deployed. Utility-scale solar farms are being approved on prime agricultural land in the Riverina, the Darling Downs, and central NSW. Community pushback is intensifying as farmland owners and rural communities recognise that the solar build is displacing food production capacity. State governments are responding with planning restrictions; the federal government is responding with subsidy structures that do not address the underlying land-use conflict.

The arithmetic is harder than the political conversation acknowledges. 82% renewable electricity by 2030 implies approximately 50–80 GW of new utility-scale solar capacity built in the next four years. At standard land utilisation of approximately 2 ha/MW, that is 100,000–160,000 hectares of land — a non-trivial fraction of the productive farmland in the eastern states.

The SBC's 1,000 GW of desert solar uses arid land at approximately 6,000–8,000 km² per Solar Region (four Solar Regions totalling 1.5 million km² of available arid land, of which 1,000 GW occupies approximately 2.6%). No agricultural displacement. No community opposition. No competing use. The solar build moves to where the sun is strongest and the land has no other productive purpose.

The farmland constraint is binding on the current renewable build at exactly the moment the build needs to accelerate. The SBC removes the constraint by relocating the build to the continent's interior.

6.4 Behavioural change as the residual mechanism

The federal Net Zero Plan published in September 2025 identifies the transport, industrial, and agricultural sectors as the areas requiring further work to close the 2035 gap. The mechanisms proposed are predominantly behavioural: increased EV incentives to drive uptake, energy efficiency standards on appliances and buildings, voluntary industry commitments under the Safeguard Mechanism, and continued offsetting via the Australian Carbon Credit Unit market.

The structural problem with this mechanism set is that it depends on voluntary commercial actors choosing to make decisions that increase their costs. The petrol vehicle is cheaper than the EV to buy on current pricing; if the EV is more expensive to run as well, no household chooses it without a subsidy. Industrial process electrification is expensive at current electricity prices; if it stays expensive, the operator does not electrify. The Safeguard Mechanism has been modelled to deliver only 12% emissions reduction against 2023 levels, with 58–68% of the net reduction target met via offsets rather than physical retirement.

The SBC inverts this. Sub-10c/kWh consumer electricity makes the EV the structurally cheaper option. Industrial electrification becomes commercially preferred at the operator's margin. The transition is driven by price, not by mandate or voluntary commitment. The same arithmetic that makes the SBC's ROI positive (Memo 20) makes the emissions outcome automatic. Behavioural compliance is not the mechanism; commercial economics is.

6.5 The international ledger has no current programme at all

Approximately 455–585 Mt CO₂/yr of coal and diesel emissions are produced in Asia-Pacific importing grids that are within HVDC range of the Australian renewable resource. Australia's current policy framework includes no programme to displace any of this. The Asia-Pacific grids will be supplied with electricity from some source in 2040 — it will either be domestic coal, regional gas, Chinese-supplied HVDC, or Australian HVDC. The current Australian policy is to be absent from the conversation.

The SBC fills this gap. The HVDC export industry is what an Australian renewable-power-export economy looks like at maturity. No other country is structurally positioned to deliver it — the combination of land, solar resource, geographic proximity to the Asian load centres, and political stability is unique. The opportunity to be the supplier is open now; it will close as importing nations commit to alternative supply arrangements over the next decade.

6.6 Putting it together

Take each piece of the legislated trajectory and stack them honestly:

• Electricity sector decarbonisation — the only piece that is partially credible, and the transmission build is failing on cost, schedule, and community acceptance.
• Continental electric freight — no programme.
• Heavy industry process heat electrification — no programme at scale, dependent on Safeguard Mechanism plus voluntary commitments.
• Mining and agricultural diesel retirement — no programme.
• Land sequestration at continental scale — constrained by water availability; the existing 20 Million Trees programme delivers 0.2 Mt/yr.
• International grid displacement — no programme.
• Article 6 credit-sharing — not on the agenda.

The federal Net Zero Plan acknowledges these gaps and names no programme that closes them. The Climate Change Authority's 2024 Annual Progress Report notes the Safeguard Mechanism delivers only 12% reduction even after the 2023 reforms. The state-level renewable energy plans are politically contested across electoral cycles, with the NSW LNP's November 2025 announcement to pause major transmission upgrades the most recent demonstration.

There is no plan that delivers the 2030 target on the legislated trajectory. There is no plan that closes the 2035 cliff. There is no plan that lands 2050 net zero. The SBC plus the MMP billion-tree policy plus HVDC export is the only programme on the table that adds up arithmetically — both ledgers included — and the only programme that pays for itself rather than depending on continuous political will across multiple election cycles. If Australia is serious about the legislated targets, this is the plan. If the SBC is rejected, the legislated targets are rejected with it.

7. The bottom line

The SBC plus the MMP billion-tree policy delivers approximately 275–325 Mt CO₂/yr of domestic retirement and sequestration at programme maturity. This hits the 2030 legislated target on time, lands the 2035 target on schedule, and brings the 2050 residual to 145–195 Mt — approximately 60% of the legislated 2050 trajectory delivered with buildable infrastructure, with the remaining 40% openly named as the long-tail engineering problem it actually is.

The SBC's HVDC interlinks separately displace approximately 455–585 Mt CO₂/yr of coal-fired and diesel-fired generation in Asia-Pacific importing nations. Clean Australian electricity arrives in the importing nation's grid; their fossil plants reduce output to make room for it. Coal plants in Indonesia, Vietnam, and the Philippines physically run fewer hours per day because Australian HVDC is supplying the grid. The CO₂ that would have been emitted is not emitted. This is not a credit transaction. It is engineering.

The MMP policy position is that Australia should negotiate Article 6 bilateral credit-sharing agreements with the importing nations — recognising the Australian investment behind the displaced emissions, recognising the importing nation's host status, and sharing the credit fairly. A 50/50 starting position would deliver approximately 230–290 Mt CO₂/yr to Australia's NDC at maturity. This is regional leadership, not credit-grabbing.

Combined global emissions impact at programme maturity: approximately 730–910 Mt CO₂/yr. The SBC at maturity delivers more global atmospheric carbon retirement than the entire current emissions of the United Kingdom and approaches the entire current emissions of Germany. This is the actual reach of an Australian renewable-power export industry built on continental infrastructure.

The without-SBC pathway delivers none of it. The legislated domestic target is missed. The 2035 cliff is steeper still. The international displacement opportunity goes uncaptured. The Asia-Pacific buys renewable electricity from somewhere; on the without-SBC pathway, it does not buy it from Australia.

The case for the SBC is the productive country it builds. The case made in this memo is what that productive country also delivers in atmospheric carbon — domestic and international, in Australia's legislated target and in the regional ledger that nobody currently counts. The with-SBC pathway delivers both. The without-SBC pathway delivers neither.