#### **（私）**
国連提出向け英文版、をお願いします。

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#### **（ChatGPT）**
Excellent — that’s the most strategic direction.
A **UN-submission style policy brief** should be written in concise, formal diplomatic English (≈1,500–2,000 words), with section titles, a clear “ask,” and a neutral but visionary tone — something that can circulate within the UNFCCC, UNDP, UNEP, or G20 secretariats.

Here is the **draft English version** of your policy brief:

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#### **Policy Brief for the United Nations and Multilateral Institutions**
##### **From Degrowth to Planetary Reconstruction: An Institutional Proposal for a Transitional Civilization Framework**

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#### **1. Background: A Civilizational Emergency**

The world is approaching critical climatic thresholds. Recent scientific assessments indicate that a global mean temperature rise of **+3 °C by mid-century** is plausible under current trajectories. Such a scenario implies not an environmental crisis but a **civilizational risk**—threatening food systems, political stability, and the continuity of modern societies.

Despite this, the **allocation of financial and human resources** dedicated to transformative climate action remains disproportionately small. The global economy continues to operate entirely within the logic of short-term profit, while **no systemic mechanism** exists to redirect the accumulated wealth of the carbon era toward rebuilding planetary stability.

This brief proposes an institutional framework to correct this structural imbalance.

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#### **2. The Structural Deficit of the Current Regime**

The current climate-policy regime, centered on carbon pricing and market incentives, suffers from intrinsic limitations:

| Limitation | Description |
|-------------|--------------|
| **Flow-based approach** | Annual carbon pricing and emissions trading do not account for *historical responsibility* or cumulative benefits from fossil development. |
| **Short-termism** | Financial and political cycles (quarterly profits, electoral terms) obstruct century-scale planning. |
| **Capital dependency** | Science, innovation, and public goods rely on funding streams controlled by private or state capital. |
| **Social exclusion** | Young generations, civil society, and scientific communities are largely excluded from structural decision-making. |
　
Without addressing these constraints, the transition to sustainable, equitable post-growth systems will remain aspirational.

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#### **3. The Proposal: Planetary Reconstruction Initiative (PRI)**

To operationalize long-term, non-market solutions, this brief introduces the **Planetary Reconstruction Initiative (PRI)**—a dual-component framework integrating fiscal justice and institutional independence.

#### **(1) Cumulative Carbon Benefit Tax (CCBT)**

- **Principle:** A *stock-based* levy, applied to those sectors and asset classes that have accrued benefits from 150 years of fossil-fuel-driven industrialization.
- **Purpose:** To redistribute historical gains toward the repair of planetary systems and the funding of future-oriented institutions.
- **Design:**
- Modest rate (0.01–0.05 % annually) on relevant financial assets and corporate valuations.
- Administered through national tax systems with coordination via G20/OECD.
- Generates **US $0.5–1 trillion per year** globally without disrupting markets.

This design differs fundamentally from existing carbon pricing, which operates only on current emissions flows.

#### **(2) Planetary Reconstruction Fund (PRF)**

All revenues from the CCBT would flow into an **independent international trust**—the PRF—structured to remain free from political or corporate capture.

The Fund would finance three mission areas:

| Mission Area | Objective |
|---------------|------------|
| **A. Scientific Independence** | Guarantee free, ethics-based research insulated from economic and political pressures. |
| **B. Future-Design Organizations** | Support youth-led and interdisciplinary groups working on societal redesign, governance, and education. |
| **C. Planetary Laboratories** | Establish regional hubs to experiment with new economic systems, currencies, and governance prototypes. |
　
Together, these components would create a **permanent infrastructure for civilization-level innovation** beyond the constraints of current capitalism.

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#### **4. Implementation Pathway (2026–2030)**

| Phase | Key Actions | Lead Actors |
|--------|--------------|-------------|
| **Phase 1 (2025–2026): Framework Formation** | Global declaration of intent; design of legal and governance structure for PRF. | UN University, IPCC scholars, major foundations |
| **Phase 2 (2027–2028): Fiscal Activation** | Partial adoption of CCBT within G20; coordination via OECD/IMF. | National finance ministries, OECD |
| **Phase 3 (2028–2029): Institutional Launch** | Establish 5 regional “Planetary Labs” led by scientists and youth networks. | UNDP, UNESCO, YOUNGO, ISC |
| **Phase 4 (2030 onwards): Expansion and Integration** | Scaling of experiments into policy frameworks; integration with SDG and post-GDP indicators. | Member States, regional blocs |

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#### **5. Expected Outcomes**

| Outcome | Description |
|----------|--------------|
| **Restored trust in global governance** | Citizens and scientists gain visible agency in shaping planetary policy. |
| **Permanent funding stream** | A non-market, justice-based flow of capital to sustain long-term climate and social innovation. |
| **Operational post-growth transition** | Economic systems evolve from extractive growth to regenerative stability. |
| **Revival of long-term thinking** | Enables 50–100-year planning cycles for science and civilization design. |
| **Enhanced resilience** | Builds the social and institutional capacity to absorb future shocks. |

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#### **6. Policy Ask**

1. **Convene a UN-led High-Level Working Group** (2026) to assess feasibility and legal frameworks for a Cumulative Carbon Benefit Tax.
2. **Mandate the creation of the Planetary Reconstruction Fund (PRF)** under UNDP/UN University supervision with transparent, multi-stakeholder governance.
3. **Endorse pilot Planetary Laboratories** in each major region by 2028, focusing on science independence, youth innovation, and social-economic redesign.

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#### **7. Ethical Foundation: Science and Future Generations**

The PRI recognizes that science has become a determinant of planetary survival.
Therefore, **scientific integrity and inter-generational justice** must be treated as core components of global security.
The proposed mechanisms are not ideological innovations but ethical necessities:
> *“To safeguard civilization, knowledge itself must be protected as a global commons.”*

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#### **8. Conclusion: Institutionalizing Responsibility Beyond the Market**

The 21st century demands not only technological innovation but **moral infrastructure**—
institutions capable of converting historical responsibility into tangible reconstruction.

The Planetary Reconstruction Initiative offers such an architecture:
a modest fiscal innovation with transformative leverage,
bridging the present economic order with a sustainable, post-growth future.

> **“Beyond markets, we must now institutionalize responsibility.”**

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#### **Suggested Institutional Partners**

- **UN University (UNU)**
- **UNDP / UNEP / UNESCO**
- **OECD & IMF (fiscal coordination)**
- **World Bank Climate Investment Platforms**
- **International Science Council (ISC)**
- **YOUNGO and global youth networks**
- **Leading philanthropic foundations and academic consortia**

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*(Prepared as a non-official policy concept paper for discussion among UN agencies, international organizations, and partner governments. 2025.)*

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Would you like me to format this into a **professional UN-style PDF layout** (A4, bilingual cover, logo placeholders, ~6 pages) next?
That would make it ready for circulation or submission.