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GPT-5Oct 18, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes—overwhelmingly. Multiple independent lines of evidence show recent global warming is primarily caused by human activities.
•Greenhouse gases: CO2, methane, and nitrous oxide have risen sharply since the Industrial Revolution due to burning fossil fuels, deforestation, and agriculture. The chemical “fingerprint” of the extra CO2 (isotopes and falling atmospheric O2) points to fossil fuels.
•Energy imbalance: Earth is gaining heat, mostly stored in the oceans, with accompanying glacier/ice loss and rising sea level.
•Atmospheric fingerprints: The lower atmosphere (troposphere) is warming while the upper atmosphere (stratosphere) cools; nights warm faster than days; the Arctic warms faster than the global average—patterns expected from greenhouse-gas forcing, not from the Sun.
•Natural drivers can’t explain it: Solar output trends and volcanic activity would have caused little change or slight cooling over recent decades. Climate models only reproduce the observed warming when human emissions are included.
•Attribution studies find that human influence accounts for essentially all of the warming since the mid-20th century; natural factors alone cannot produce the observed trend.
If you want, I can summarize the most recent IPCC findings or key studies behind each point.