Google 與 Terradot 把稻田甲烷減排和岩石風化除碳綁成百萬噸級合約

Reuters 與 ESG Today 報導，Google 與 Terradot 簽署其迄今最大規模除碳安排，在巴西南里奧格蘭德州超過 20 萬公頃稻田，同時推動甲烷抑制與強化岩石風化。合約目標是 2030 年前交付 100 萬噸二氧化碳當量的甲烷減排，並在 2040 年前再交付 100 萬噸耐久除碳。

Reuters and ESG Today report that Google and Terradot have agreed their largest carbon-removal arrangement to date across more than 200,000 hectares of rice fields in Rio Grande do Sul, Brazil. The project targets one million tonnes of CO2-equivalent methane abatement by 2030 and a further one million tonnes of durable carbon removal by 2040.

稻田長期淹水會形成厭氧環境並釋放甲烷。Terradot 計畫以間歇灌溉降低甲烷與用水，再把碎玄武岩施作於農地，利用礦物風化固定二氧化碳。Google 既是買方也是 Terradot 投資人，希望把此模式複製到其他稻作地區。

Continuously flooded rice fields create anaerobic conditions that emit methane. Terradot plans to use alternate wetting and drying to reduce methane and water use, then apply crushed basalt so mineral weathering removes carbon dioxide. Google is both the buyer and an investor in Terradot and wants the model to be replicable in other rice-growing regions.

同一片土地產生兩種氣候效益，不等於可用同一套帳本。甲烷減排的基準期、灌溉紀錄與農田活動資料，和岩石來源、施作量、風化速率及耐久性驗證不同。若空間邊界、時間邊界或不確定性折扣未分開，容易出現重複計量與交付爭議。

Two climate outcomes from the same land do not belong in one undifferentiated ledger. Methane baselines, irrigation records and field activity data differ from rock origin, application mass, weathering rates and durability verification. Overlapping spatial or time boundaries could create double counting and delivery disputes.

專案執行須把農戶地塊、灌溉週期、玄武岩批次、採樣點與信用簽發規則建立一對一連結。買方可將付款分成里程碑，只有在農戶採行紀錄、第三方量測與獨立驗證聲明符合各自方法學時，才確認甲烷或除碳交付。

Implementation should link each farm plot, irrigation cycle, basalt batch, sampling point and issuance rule. Milestone payments can be released only when farmer practice records, third-party measurement and independent verification statements satisfy the relevant methodology for either methane abatement or carbon removal.

四筆固定來源證據包含 Reuters 對本交易的量級、成本與驗證安排，ESG Today 對雙軌技術與農戶效益的整理，以及 Reuters 對 Google 在巴西除碳採購與岩石型除碳市場的前期報導。它們支持交易背景與市場脈絡，但不取代專案未來的逐批量測和信用簽發。

Four fixed-scope records cover Reuters reporting on the transaction scale, cost and verification design, ESG Today reporting on the paired technologies and farmer benefits, and earlier Reuters coverage of Google carbon purchases in Brazil and rock-based removal markets. They support the deal and market context, but do not replace future batch measurement or credit issuance.

此案把碳採購從單一噸數合約推向結合農法、用水、甲烷與礦物固定的多目標交付。碳信用開發商、農業合作組織、買方採購團隊與驗證機構將需要更清楚的責任分界，尤其是農戶收益不能被當成減排量的替代證據。

The transaction moves carbon procurement beyond a single-tonnage offtake toward a multi-outcome delivery model involving farming practice, water, methane and mineral storage. Credit developers, farmer organisations, buyer procurement teams and verifiers will need clearer boundaries, especially because farmer benefits cannot substitute for measured climate delivery.

SNN 編輯分析｜揭露前證據基礎設施觀點：外部事件事實邊界：本案可確認的外部市場事實，是大型科技買方在同一交易架構中同時納入短期甲烷減排與長期碳移除，但兩類成果仍依不同方法、交付條件與驗證要求分別管理。以下內容為 SNN 對其可能傳導至台灣市場的編輯分析，不代表台灣目前已有相同信用產品、方法學認可或監管安排。對台灣市場而言，主要傳導機制不在於直接複製國外交易，而是買方的方法學要求、證據條件與付款節點，可能逐步進入碳供應商、農業專案、科技業採購與第三方查驗合約。從揭露前證據基礎設施角度，台灣參與者需要在申報、付款或信用簽發之前，把責任主體、原始紀錄、驗證時點及方法版本先形成可追溯的證據鏈。第一，台灣稻作合作社與農業科技商應由專案經理在每季灌溉週期結束後，核對地塊清冊、水位感測紀錄、種植日誌及基準排放模型。只有在地塊、期間與監測資料可相互對應，且抽樣不確定性符合適用方法學門檻時，才應進入甲烷減排申報或後續驗證程序。第二，碳信用開發商與礦物供應商應由品質主管在每批岩粉出貨時，以及年度信用簽發前，封存採石來源證明、粒徑檢測、施作重量單及土壤採樣報告。若批次、施作地塊或採樣紀錄無法建立一對一或可驗證的對應關係，就不應合併計量或納入同一簽發批次。第三，科技業碳採購與財務團隊應在簽約、里程碑付款及最終信用退休三個時點，分別查核甲烷驗證聲明、碳移除耐久性報告、登錄序號及付款紀錄。若方法學版本、監測邊界或驗證條件在履約期間發生變更，應重新進行價格、履約與證據風險審查，再決定是否付款、接受交付或退休信用。上述內容屬於台灣市場的條件式傳導分析。其重點不是主張台灣已採用相同制度，而是指出當國際買方開始把不同減碳成果放入同一採購架構時，台灣供應商、專案開發商、企業採購者與查驗機構，將更需要在正式揭露、付款或信用認列之前建立可驗證、可追溯且可重新檢查的證據基礎。

SNN editorial analysis | Pre-Disclosure Evidence Infrastructure perspective: Foreign-event fact boundary: The confirmed external-market fact is that a large technology buyer is placing short-horizon methane reduction and long-horizon carbon removal within the same transaction structure, while continuing to manage the two outcome types through separate methodologies, delivery conditions and verification requirements. The analysis below addresses possible transmission to the Taiwan market and does not indicate that Taiwan currently recognises the same credits, methodologies or regulatory treatment. For Taiwan, the principal transmission mechanism is not the direct replication of the foreign transaction. It is the possible migration of buyer methodology requirements, evidence conditions and payment triggers into contracts used by carbon suppliers, agricultural projects, technology-company procurement teams and third-party assurance providers. From a Pre-Disclosure Evidence Infrastructure perspective, Taiwan market participants would need to establish traceable evidence chains covering responsible parties, source records, verification points and methodology versions before claims, payments or credit issuance occur. First, after each seasonal irrigation cycle, Taiwan rice cooperatives and agri-tech providers should require the project manager to reconcile the plot register, water-level sensor records, cultivation diary and baseline-emissions model. A methane-reduction claim should move forward only when the plot, reporting period and monitoring records can be matched, and when sampling uncertainty remains within the applicable methodology threshold. Second, at each rock-powder shipment and again before annual credit issuance, carbon-credit developers and mineral suppliers should require the quality owner to preserve the quarry-origin certificate, particle-size test, application weight ticket and soil-sampling report. Where a shipment batch, application plot or sampling record cannot be linked through a one-to-one or otherwise verifiable relationship, it should not be aggregated or included in the same issuance batch. Third, at contracting, milestone payment and final credit retirement, technology-company carbon procurement and finance teams should separately inspect the methane verification statement, carbon-removal durability report, registry serial number and payment record. If the methodology version, monitoring boundary or verification condition changes during performance, the buyer should conduct a renewed price, delivery and evidence-risk review before making payment, accepting delivery or retiring the credit. This is a conditional Taiwan-market transmission analysis. It does not assert that Taiwan has adopted the same framework. The relevant implication is that, as international buyers begin placing different climate outcomes within a common procurement structure, Taiwan suppliers, project developers, corporate buyers and assurance providers may face a stronger need to establish verifiable, traceable and re-checkable evidence before formal disclosure, payment or credit recognition.

後續應追蹤兩種方法學的最終版本、第三方驗證頻率、成本下降路徑、農戶收益分配、信用登錄與退休方式，以及 2028 年商業化擴張是否保留地塊層級的可追溯性。

Future checks should cover final methodology versions, third-party verification frequency, the cost-reduction path, farmer-benefit allocation, registry issuance and retirement, and whether commercial scaling planned for 2028 preserves plot-level traceability.