Sustainability executives should focus on how AI data center buildouts are financed, as funding terms shape environmental outcomes. The four largest hyperscalers—Amazon, Microsoft, Alphabet and Meta—plan to spend roughly $725 billion on capital investments in 2026, up about 77 percent from last year. Goldman Sachs forecasts more than $5 trillion of combined hyperscaler capital spending between 2025 and 2030. Amazon’s free cash flow is expected to turn negative this year. Meta’s two-gigawatt Hyperion campus in Louisiana was built via a joint venture with private-credit manager Blue Owl, with institutional lenders including Pimco, Apollo and BlackRock funding roughly $27 billion in bonds; the debt does not appear on Meta’s books. Close to $125 billion moved into similar project financing within months, and total data-center debt issuance nearly doubled in less than a year, to $182 billion. “Speed-to-power” financing favors on-site gas over slower clean interconnection; short-term debt to build a 20-year asset narrows operating choices. Clean-power interconnection queues run five to seven years, while an on-site gas turbine takes 18 months to build.