Carbon, Methane, and Climate Adaptation

Engine: Engine 1, Engine 6

Framing

Carbon and methane are the two emissions priced comprehensively under the Accord. The carbon fee is the centerpiece: $80/ton starting, escalating $30/year automatically (statutory escalator, no vote required) to a $680 cap. Methane is priced independently through the Methane Accountability and Reduction Levy (MARL). Revenue flows to household dividends up to a $160/ton-equivalent ceiling on carbon; excess carbon revenue and all Methane Accountability and Reduction Levy revenue flow to the Climate Adaptation Trust. Methane was present in prior DNA versions and is retained in v10.

Carbon fee parameters

Starting rate: $80/ton CO₂-equivalent (Year 1)

Annual escalator: +$30/year (automatic statutory escalator, no vote required)

Ceiling: $680/ton (~Year 20)

Energy Stipend rebate cap: $160/ton-equivalent household level

Above rebate cap: flows to Climate Adaptation Trust

Border Carbon Adjustment (BCA): imports taxed to match domestic pricing; WTO Article XX legal basis

The Energy Stipend

Fully rebated until the carbon fee exceeds $160/ton (approximately Year 3). Thereafter the rebate pool is frozen at the level generated by $160/ton × remaining emissions. Each adult receives one share; children under 18 receive half a share; rural residents receive 1.3× share. Bottom 70% of households are net beneficiaries of the combined carbon fee and stipend.

Methane Accountability and Reduction Levy (MARL)

Methane is priced separately from CO₂ because of its much higher short-term warming potential (approximately 80× CO₂ over 20 years) and its distinct source architecture. Methane Accountability and Reduction Levy covers three structurally different source categories with separate measurement approaches.

Starting rate: $1,200/ton CH₄ (Year 1)

Annual escalator: +$240/year

Ceiling: $2,880/ton (Year 16)

Intentional venting/dumping: 5× standard rate (environmental enforcement, not creditable)

The three source categories:

Fossil fuel venting and pipeline leakage — Satellite crosscheck with 60-day response window before EPA back-bills at 2× reported rate.

Agricultural enteric fermentation — Per-head levy by species (beef feedlot ~$103/head Year 1; dairy ~$138). Stackable Feedstock Adjustment Credits reduce up to 75%: 3-NOP/Bovaer (−30%), Asparagopsis seaweed (−50%), rotational grazing (−10%), digesters (−80% on manure fraction).

Manure management — Assessed as separate per-head increment on confinement operations; digester credit additive to Carbon Fee biogas offset.

No double-counting with Carbon Fee

Custody-transfer rule: gas that leaks before combustion is a Methane Accountability and Reduction Levy event; gas that reaches a burner tip is a Carbon Fee event. Natural Methane Reconciliation protocol enforces this monthly. No molecule pays both.

Methane Accountability and Reduction Levy revenue routing

Methane Accountability and Reduction Levy revenue (fossil + agricultural) flows to the Climate Adaptation Trust. Affected farmers may apply separately for transition grants — digester capital, feed-additive cost-share, breed-registry support — funded from the General Fund through standard appropriation, not as a fixed percentage carve-out of the levy. The architecture deliberately avoids trivial earmarks: the levy prices the externality at source, and the transition-grant program eases the burden where it falls hardest, but the two are not mechanically linked by a percentage.

The Climate Adaptation Trust

Ring-fenced trust fund dedicated to climate adaptation. Funded through two streams beginning Year 4:

All Methane Accountability and Reduction Levy revenue (fossil + agricultural)

All carbon revenue above the $160/ton household-dividend rebate ceiling (begins Year 4 when the carbon fee first exceeds the rebate level)

Ring-fencing (architectural)

The Climate Adaptation Trust is statutorily ring-fenced: (a) funded exclusively from the two streams named above; (b) held in special-issue Treasury securities; (c) disbursed only by the Expert Panel on Climate Resilience (EPCR) for qualifying adaptation expenditures; (d) excluded from deployable surplus calculations, debt-retirement calculations, and any appropriation against unrelated purposes. Congress cannot reallocate the Trust to General Fund expenditures without affirmative statutory action overriding the ring-fence. This is the same architectural logic that protects the Social Security Trust Fund under current law; applied to climate because the adaptation obligation extends 50-70 years beyond the revenue source.

Gross flow vs. net flow

Gross flow is the inflow to the Trust from these two sources. Year 4 inflow approximately $200-360B; peak inflow approximately $600B+ during Years 8-12; cumulative accumulation approximately $4.5T by Year 10 and $8.25T over 25 years.

Net flow is gross less project disbursements. During the first ten years, the Trust functions largely as a cash reserve. Manpower capacity — engineers, construction workforce, project-management bandwidth — is the binding constraint, not capital. Trust assets are held in special-issue Treasury securities; interest savings accrue to the General Fund during the reserve-accumulation phase.

What the Trust funds

Projects are prioritized by the Expert Panel on Climate Resilience (EPCR) with FEMA, Army Corps, and EPA co-governance. EPCR is the trustee that evaluates best use of funds across the ~200-year arc of climate impacts. Most adaptation investments are deferred 10-50 years from enactment, aligned with physical climate-risk timelines and workforce availability. Eligible categories: coastal defense infrastructure for dense urban nodes, wildfire hardening, flood resilience, agricultural transition in climate-stressed regions, grid hardening against climate-driven disruption, and water-system modernization. The Trust is an intergenerational reserve drawn down across the ~200-year arc of physical-climate damage. One-time-chance framing: declining carbon use means revenue tapers as decarbonization succeeds; there will never be another opportunity to capitalize a trust of this scale from carbon revenue.

What the Trust does NOT fund

Managed retreat is not an Accord program. The Accord does not operate a federal buyout program for property in high-risk zones. Retreat from high-risk areas is handled through NFIP reform (see Chapter 17): actuarial pricing on a 5-year glide path, no-rebuild zone designation by FEMA, and no federal disaster rebuilding assistance for non-compliant structures. Property values adjust to reflect the withdrawal of subsidized insurance. This is the market working, not a Trust expenditure category.

Input Shield macrogovernor

If energy prices spike more than 15% in a quarter (EIA data), the Input Shield macrogovernor automatically pauses the carbon escalator for up to one year and increases the Energy Stipend by 25% one-time. Paused escalation is added to the following year's step — the terminal rate is reached regardless.