A comparison of published AI models between 2012 and 2025 shows that COâ‚‚ emissions from training these models have steadily increased. The training of GPT-3, which was released in 2020, generated around *** tons of COâ‚‚. Its successor model GPT-4 (2023) already reached tons. The highest emissions are associated with the training of Grok 4 (2025), which released * tons of COâ‚‚.
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Stanford University. (April 13, 2026). Emission of COâ‚‚ equivalent from training artificial intelligence (AI) models in 2012-2025 (in metric tons) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 26, 2026, from /statistics/1465353/total-co2-emission-of-ai-models/
Stanford University. "Emission of COâ‚‚ equivalent from training artificial intelligence (AI) models in 2012-2025 (in metric tons)." Chart. April 13, 2026. ÌÇÐÄÆƽâ°æ. Accessed July 26, 2026. /statistics/1465353/total-co2-emission-of-ai-models/
Stanford University. (2026). Emission of COâ‚‚ equivalent from training artificial intelligence (AI) models in 2012-2025 (in metric tons). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 26, 2026. /statistics/1465353/total-co2-emission-of-ai-models/
Stanford University. "Emission of Coâ‚‚ Equivalent from Training Artificial Intelligence (Ai) Models in 2012-2025 (in Metric Tons)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 13 Apr 2026, /statistics/1465353/total-co2-emission-of-ai-models/
Stanford University, Emission of COâ‚‚ equivalent from training artificial intelligence (AI) models in 2012-2025 (in metric tons) ÌÇÐÄÆƽâ°æ, /statistics/1465353/total-co2-emission-of-ai-models/ (last visited July 26, 2026)
Emission of COâ‚‚ equivalent from training artificial intelligence (AI) models in 2012-2025 (in metric tons) [Graph], Stanford University, April 13, 2026. [Online]. Available: /statistics/1465353/total-co2-emission-of-ai-models/
