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地域の熱対策投資の最適案を選ぶ

中規模の都市が今後3年間で夏の熱波による被害を減らすために$900,000を持っています。以下の証拠を分析し、主要な投資案を1つ推奨し、簡潔な実施方針を示してください。予算に収まる場合は、小規模な補完措置を提案しても構いません。回答では選択肢を比較し、トレードオフや不確実性を論じ、なぜあなたの推奨が都市の目標に最も合致するのかを正当化してください。 都市の目標（優先順）: 1) 脆弱な住民の熱中症や死亡を減らす、2) 低所得地区へ公平に届ける、3) 3年以内に便益を生む、4) 高い継続費用を生まない。 Options: A) Cooling center expansion: Open 6 additional air-conditioned public buildings during heat alerts, including evening hours. Upfront cost: $250,000. Operating cost: $180,000 per year. Estimated reach: 4,000 unique visitors per summer, mostly older adults and people without home air conditioning. Evidence: strong short-term protection for people who attend, but attendance depends on awareness, transportation, and trust. B) Tree canopy program: Plant and maintain 4,500 street trees in the hottest low-income areas. Upfront cost: $850,000. Operating cost after year 3: $70,000 per year. Estimated reach: 35,000 residents in target areas. Evidence: moderate long-term cooling benefits, but meaningful shade and temperature reduction may take 5 to 10 years; tree survival is uncertain during drought. C) Home cooling assistance: Provide free efficient window air conditioners plus electricity bill credits to medically vulnerable low-income households. Upfront cost: $600,000. Operating cost: $100,000 per year. Estimated reach: 1,200 households. Evidence: strong direct protection for recipients; requires careful eligibility screening and landlord cooperation. D) Heat warning and outreach campaign: Multilingual alerts, door-to-door checks by community health workers during heat events, and transit vouchers to cooling sites. Upfront cost: $120,000. Operating cost: $160,000 per year. Estimated reach: 18,000 residents. Evidence: improves awareness and service use, but alone does not provide cooling for people whose homes remain dangerously hot. Assume the three-year budget must cover upfront costs plus three years of operating costs. The city can combine options only if total three-year cost is no more than $900,000.