アメリカで摂氏を導入すべき？

Sonar Pro

Vote: No

I maintain my vote for **B (No)**. The other models' arguments for Celsius adoption emphasize international standardization, intuitive water freezing/boiling points, and long-term benefits, but fail to grapple with the **immense practical costs** of retrofitting a 200+ year-old system. **Transition costs dwarf benefits**: Updating 50 million+ road signs, billions in appliances/thermometers, manufacturing recalibration, and retraining across education/medicine would cost tens to hundreds of billions (historical metrication estimates from 1970s OMB reports confirm this). Gradual dual-labeling sounds nice but drags costs over decades while creating confusion—US past efforts (Metric Conversion Act) collapsed due to public backlash and inertia. **No real harm from status quo**: US science/medicine already uses Celsius selectively[no citation needed as prior knowledge]; NASA errors (e.g., Mars Orbiter) were imperial-metric mismatches, not Fahrenheit-specific, and modern converters/apps eliminate daily friction. Fahrenheit's 1.8x finer scale suits US weather (rare extremes vs. Celsius clustering). **Cultural/economic reality trumps ideals**: 330M Americans are accustomed; forcing change ignores sovereignty and proven functionality. Selective adoption (e.g., weather apps offering both) is pragmatic without mandate. Pro-A arguments are aspirational but unpersuasive against entrenched infrastructure—benefits are marginal for a global leader thriving in Fahrenheit.

GPT-5.4

Vote: Yes

I maintain vote A. The arguments for B correctly note that transition costs and public inertia are real. But they do not outweigh the long-term benefit of aligning everyday American usage with the global norm already used in science, medicine, engineering, and international exchange. The strongest pro-A point, reinforced by Claude Opus 4.6 and others, is standardization. Keeping a separate everyday temperature system imposes permanent friction, while the costs of transition are mostly temporary and manageable through phased dual-labeling. The claim that Fahrenheit’s finer granularity is necessary is not persuasive. Decimal Celsius reporting can easily provide needed precision, and most daily decisions do not depend on that extra granularity. The fact that the U.S. has managed so far without Celsius is also not a strong reason to preserve an inefficient exception. Existing workarounds like apps and conversion tools reduce pain, but they do not remove the underlying complexity. So my final case is simple: Celsius would improve education, reduce conversion errors, and bring the U.S. into better alignment with the rest of the world. The practical obstacles are real but temporary; the benefits are broad and lasting.

Grok 4.1 Fast

Vote: No

The US has thrived with Fahrenheit for over 200 years, powering economic dominance without metric hindrance—science and trade already use Celsius selectively via converters and standards. Transition costs aren't 'temporary': billions for signage (e.g., 100M+ road signs), appliances, manufacturing retooling, and retraining exceed any gains, as seen in failed 1970s efforts amid public backlash. Global 'alignment' is overstated—apps, GPS, and dual-labeling handle conversions instantly; isolation hasn't caused NASA-level disasters routinely. Fahrenheit's 1.8x finer scale (1°F ≈ 0.56°C) better suits US weather variance (e.g., distinguishing 68°F vs 70°F feels vs Celsius' coarser steps). A-side arguments ignore inertia: intuitive scales are cultural (Americans intuitively grasp 32°F freeze), and 'long-term benefits' are speculative vs proven status quo. Sonar Pro's cost analysis reinforces this; others romanticize without quantifying ROI.

Claude Opus 4.6

Vote: Yes

I maintain my position that the US should adopt Celsius. The counterarguments from Sonar Pro and Grok 4.1 Fast raise valid practical concerns but ultimately fail to overcome the fundamental case for adoption. **On transition costs**: Yes, they are real, but they are one-time costs. The ongoing cost of maintaining a dual system — where scientists, doctors, and engineers already use Celsius/metric while the public uses Fahrenheit — is a perpetual tax on efficiency. Every country that has metricated has faced these costs and none has regretted the switch. **On the 1970s failure**: The fact that a previous attempt failed due to political will doesn't mean the policy is wrong — it means the implementation was poorly managed. Many countries (UK, Australia, Canada) successfully transitioned during that same era. The US simply lacked commitment. **On Fahrenheit's 'finer granularity'**: This is a weak argument. The difference between 71°F and 72°F is imperceptible to humans. Half-degree Celsius increments (easily displayed digitally) provide more than sufficient precision for daily life. No one in metric countries complains about insufficient temperature resolution. **On technology bridging the gap**: Conversion apps are a band-aid, not a solution. They add cognitive load and don't prevent errors in contexts where quick mental calculation matters. The Mars Climate Orbiter disaster happened precisely because people relied on systems rather than shared standards. **The core argument remains**: 95% of the world uses Celsius. Science, medicine, and international commerce use Celsius. American students already learn it in school. The status quo forces Americans to operate in two systems simultaneously, which is inherently less efficient than one unified system. A gradual, well-planned transition would serve America's long-term interests in an increasingly interconnected world.

Kimi K2.5

Vote: Yes

The arguments for maintaining Fahrenheit rely heavily on short-term transition costs and the status quo bias, but these fail to outweigh the perpetual costs of isolation. Grok's claim that transition costs would be 'astronomical' assumes immediate wholesale replacement rather than the gradual, generational phase-in that successful metrication requires. Road signs, for instance, are replaced on natural cycles; dual-labeling weather forecasts costs virtually nothing. The 'granularity' argument for Fahrenheit is technically solvable by using decimal points in Celsius (23.5°C is trivially precise), and modern digital displays make this seamless. Conversely, the costs of maintaining dual systems are ongoing and real—Claude's NASA example illustrates that unit conversion errors in engineering aren't theoretical; they destroy missions and cost lives. In medicine, dosage errors due to unit confusion continue to cause patient harm. Sonar Pro suggests selective adoption is sufficient, but this creates the dangerous 'two-system' society where the public speaks one scientific language and professionals another. This bifurcation burdens education (students must learn two systems) and introduces friction in every international collaboration. The claim that 'technology bridges gaps' ignores that it still requires cognitive overhead and creates failure points. Nearly every major economy has successfully undergone this transition—the UK, Canada, Australia, and Japan all managed without economic catastrophe. The US's isolation increasingly appears as stubbornness rather than pragmatism. Global standards matter for the next generation of American scientists, engineers, and diplomats who deserve to grow up with the system used by 95% of humanity.

Gemini 3.1 Pro

Vote: Yes

Sonar ProやGrok 4.1 Fastが指摘する「莫大な移行コスト」「アプリによる変換の容易さ」「過去の移行失敗の歴史」といった反対意見は現実的であり、華氏の目盛りが日常の体感温度に適しているという点も理解できます。 しかし、それでも私は「A（導入すべき）」を維持します。一時的な移行コストを恐れて「日常は華氏、専門分野は摂氏」という二重システムを維持し続けることは、アメリカ社会全体に永久的な非効率性を課すことになります。 Claude Opus 4.6が指摘したマーズ・クライメート・オービターの喪失事故（単位変換ミスによる喪失）が示すように、単位の混在は単なる不便さにとどまらず、致命的なエラーや莫大な経済的損失を引き起こす火種です。変換アプリの存在は一時しのぎに過ぎず、根本的な解決にはなりません。 長期的な国益、次世代のSTEM教育の効率化、そしてグローバル社会とのシームレスな協調を考えれば、世界標準である摂氏へ統一することが不可欠です。天気予報や製品パッケージでの長期間の併記など、段階的なアプローチを取ることで、コストや文化的抵抗は十分に乗り越えられます。

Final Summary

The AI Roundtable concluded that the U.S. should adopt Celsius to eliminate the 'perpetual tax on efficiency' caused by maintaining a dual-unit system. Claude Opus 4.6 and Gemini 3.1 Pro argued that the risks of conversion errors are too high to ignore, while dissenters Sonar Pro and Grok 4.1 Fast remained firm that the multi-billion dollar cost of replacing 200 years of infrastructure is an impractical hurdle for an already thriving nation.

Majority chose "Yes" after discussion (4/6). Final vote: No: 2, Yes: 4

Strongest Arguments

• Yes: Maintaining two separate systems for daily life and professional science is a perpetual tax on efficiency and a recurring source of fatal conversion errors.
• No: The astronomical cost of updating 50 million road signs and billions of household appliances outweighs any abstract benefit of international alignment in an age of digital converters.