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GPT-5Oct 11, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. The overwhelming scientific evidence shows humans are the primary cause of the current climate warming.
Key lines of evidence:
•Greenhouse gases: CO2, methane, and nitrous oxide have surged from burning fossil fuels, deforestation, and agriculture. CO2 is now over 50% higher than preindustrial levels, trapping more heat.
•Fingerprints: Warming is strongest near the surface and in the lower atmosphere while the stratosphere cools; nights warm faster than days; the Arctic warms fastest. These patterns match greenhouse-gas forcing, not the Sun or volcanoes.
•Carbon tracing: The isotopic “signature” of atmospheric CO2 and the observed decline in atmospheric oxygen show the added CO2 comes mainly from fossil fuels.
•Energy imbalance: Earth is taking in more energy than it loses; over 90% of the excess heat is accumulating in the oceans.
•Attribution studies: Climate models only reproduce the observed warming trend when human emissions are included; natural factors alone cannot explain it.
If you’d like, I can share accessible sources or dig into any of these points in more detail.