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GPT-5Sep 27, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. The recent warming of Earth is overwhelmingly caused by human activities.
What’s driving it
•Greenhouse gases from burning fossil fuels, deforestation, agriculture, and industry (mainly CO2, plus methane and nitrous oxide) trap extra heat.
•Aerosols and land-use changes also affect climate, but their net effect is smaller and partly offsets some warming.
How we know
•Physics and measurements: rising greenhouse-gas concentrations and a measured increase in Earth’s heat imbalance.
•Fingerprints: the lower atmosphere warms while the stratosphere cools; nights warm faster than days; polar regions warm more quickly—patterns expected from greenhouse-gas forcing, not from the Sun.
•Attribution studies: climate models match observed warming only when human emissions are included; natural factors alone cannot explain the trend.
•Carbon “signature”: the isotopic makeup of atmospheric CO2 shows it comes largely from fossil fuels.
•Context: the rate and scale of recent warming are far beyond natural variability seen in modern observations and paleoclimate records.
In short: humans are the dominant cause of the climate change observed since the mid‑20th century. If you’d like, I can share plain-language reports or key figures that summarize this evidence.