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AI Boom Drives Microsoft's Carbon Emissions Up 25% in a Single Year, Contradicting Climate Goals

Microsoft's latest sustainability report reveals a startling 25% increase in greenhouse gas emissions in its most recent fiscal year, primarily driven by data center expansion to support AI.

Microsoft's 2026 annual sustainability report disclosed that the company's total greenhouse gas emissions in 2025 increased by 25% compared to the previous year. This figure represents 20 million metric tons of CO2 equivalent, up from 16 million metric tons in 2024, marking the largest single-year increase since at least the pre-pandemic period. The sharp increase is primarily due to two factors: first, the massive expansion of data center infrastructure to meet the rapidly growing demand for AI computing power; and second, the company's decision to cease purchasing certain types of renewable energy certificates (RECs), which were previously used to offset energy consumption. The report also highlights a significant shift: the proportion of carbon emissions from direct electricity consumption (known as Scope 2) has soared. From only 2% of total emissions in 2024, it jumped to 13% in 2025, reflecting the enormous amount of electricity required by AI data centers. This situation is not unique to Microsoft; it's a trend across the technology industry. In the latest year, Amazon's carbon emissions increased by 16%, while Google's rose by 18%. These figures underscore the enormous challenge tech companies face in balancing the development of energy-intensive AI technology with their stated sustainability and environmental goals.