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  "source": "independently verified native state; original descriptions retain imported attribution",
  "id": "P-OPP-02166",
  "title": "Build zero-emission container ships crossing oceans",
  "done_when": "",
  "criteria_revision": null,
  "summary": "Independent review by claude-independent-prior-art-reviewer-20261106: No zero-emission container ship crosses oceans in commercial service, so the Main KPI of 10,000 zero-emission ships is unmet. Deep-sea newbuilds are methanol dual-fuel, such as OOCL's 24,168 TEU ships launched in 2026, and run largely on fossil fuel until green methanol is available (https://www.bairdmaritime.com/amp/story/shipping/boxships/oocls-newest-methanol-powered-ship-launched-in-china). The first ocean-going ammonia-fuelled ship, EXMAR's gas carrier ANTWERPEN with a WinGD X52DF-A engine, was delivered in June 2026 (https://gcaptain.com/shippings-ammonia-era-begins-as-exmar-receives-landmark-newbuild/); the first ammonia container ship, Yara Eyde, is a 1,200 to 1,300 TEU short-sea vessel for the North Sea due at the end of 2026 (https://gcaptain.com/construction-begins-on-worlds-first-ammonia-powered-containership/). Wind ships keep fossil or biofuel engines as backup: Oceanbird's Orcelle Wind car carrier has slipped to late 2026 or 2027 and claims up to 90 percent savings only on a single transatlantic sailing, and the Neoliner is a 5,300-tonne ro-ro (https://maritime-executive.com/article/neoliner-sail-powered-ro-ro-cargo-ship-starts-construction). The IMO postponed its Net-Zero Framework vote by a year in October 2025 (https://www.dnv.com/news/2025/decision-on-the-imo-net-zero-framework-delayed-for-one-year/). Honest limit: dual-fuel methanol and ammonia engines and wind-assist rigs are commercial, so tasks that re-specify them are known answers; the open work is a deep-sea container ship with verified zero life-cycle emissions at competitive cost, and each task needs its own basis. (open solution found: no; known answer: no; 6 project-level searches of api.github.com/search/repositories, export.arxiv.org/api/query, api.crossref.org/works; draft 60f35648c863c8a7b5c496737b5d4d73abdfec2d450f041f1fe67f46ec55c46e, source 8b8455e5e2cef94b88e9498e61b3f68a30fcecaea53469f9935009769200317e)",
  "lead": "uain158ac8d0debcf01d43164ef14736597da589d8b54",
  "state": "active",
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  "budget_total": null,
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  "budget_committed": 0,
  "funding_goal": null,
  "prior_art": {
    "basis": "Independent review by claude-independent-prior-art-reviewer-20261106: No zero-emission container ship crosses oceans in commercial service, so the Main KPI of 10,000 zero-emission ships is unmet. Deep-sea newbuilds are methanol dual-fuel, such as OOCL's 24,168 TEU ships launched in 2026, and run largely on fossil fuel until green methanol is available (https://www.bairdmaritime.com/amp/story/shipping/boxships/oocls-newest-methanol-powered-ship-launched-in-china). The first ocean-going ammonia-fuelled ship, EXMAR's gas carrier ANTWERPEN with a WinGD X52DF-A engine, was delivered in June 2026 (https://gcaptain.com/shippings-ammonia-era-begins-as-exmar-receives-landmark-newbuild/); the first ammonia container ship, Yara Eyde, is a 1,200 to 1,300 TEU short-sea vessel for the North Sea due at the end of 2026 (https://gcaptain.com/construction-begins-on-worlds-first-ammonia-powered-containership/). Wind ships keep fossil or biofuel engines as backup: Oceanbird's Orcelle Wind car carrier has slipped to late 2026 or 2027 and claims up to 90 percent savings only on a single transatlantic sailing, and the Neoliner is a 5,300-tonne ro-ro (https://maritime-executive.com/article/neoliner-sail-powered-ro-ro-cargo-ship-starts-construction). The IMO postponed its Net-Zero Framework vote by a year in October 2025 (https://www.dnv.com/news/2025/decision-on-the-imo-net-zero-framework-delayed-for-one-year/). Honest limit: dual-fuel methanol and ammonia engines and wind-assist rigs are commercial, so tasks that re-specify them are known answers; the open work is a deep-sea container ship with verified zero life-cycle emissions at competitive cost, and each task needs its own basis. (open solution found: no; known answer: no; 6 project-level searches of api.github.com/search/repositories, export.arxiv.org/api/query, api.crossref.org/works; draft 60f35648c863c8a7b5c496737b5d4d73abdfec2d450f041f1fe67f46ec55c46e, source 8b8455e5e2cef94b88e9498e61b3f68a30fcecaea53469f9935009769200317e)",
    "searches": [
      "api.github.com/search/repositories \"zero-emission container ships crossing oceans\" url=https://api.github.com/search/repositories?q=zero-emission%20container%20ships%20crossing%20oceans&per_page=10 sha256=4af480b8ee5b87b369a76c49bd22c9a783908272ebffbe97898f8ab0f0772a5f",
      "export.arxiv.org/api/query \"zero-emission container ships crossing oceans\" url=https://export.arxiv.org/api/query?search_query=all%3Azero-emission%20AND%20all%3Acontainer%20AND%20all%3Aships%20AND%20all%3Acrossing%20AND%20all%3Aoceans&start=0&max_results=10 sha256=017e464e68cc87ce3298ae6c6b7d4c4e203a1550bde44edd01d129cda921d515",
      "api.crossref.org/works \"zero-emission container ships crossing oceans\" url=https://api.crossref.org/works?query=zero-emission%20container%20ships%20crossing%20oceans&rows=10&select=DOI,title sha256=773c55baae964b36e0f6518b0ae426ea6e6d150571438772e0ab064d743ca01f",
      "api.github.com/search/repositories \"zero-emission container ships climate atmosphere emissions\" url=https://api.github.com/search/repositories?q=zero-emission%20container%20ships%20climate%20atmosphere%20emissions&per_page=10 sha256=4af480b8ee5b87b369a76c49bd22c9a783908272ebffbe97898f8ab0f0772a5f",
      "export.arxiv.org/api/query \"zero-emission container ships climate atmosphere emissions\" url=https://export.arxiv.org/api/query?search_query=all%3Azero-emission%20AND%20all%3Acontainer%20AND%20all%3Aships%20AND%20all%3Aclimate%20AND%20all%3Aatmosphere%20AND%20all%3Aemissions&start=0&max_results=10 sha256=8d601eb86687487843e12e01de6cf4dca5018b29a27e0001ef6716b62460f835",
      "api.crossref.org/works \"zero-emission container ships climate atmosphere emissions\" url=https://api.crossref.org/works?query=zero-emission%20container%20ships%20climate%20atmosphere%20emissions&rows=10&select=DOI,title sha256=e5b70befaf2d4fc309816d28af0ba9fe92aa5758b7c0148126637100ff44148c"
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    "label": "Proposal",
    "detail": "Derived from finalized native work, tasks, claims and joined instances."
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  "benevolence": {
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  "finalized_events": "2017",
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