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GPT-5Nov 4, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. Human activities are the dominant cause of the warming observed since the mid‑20th century.
Why we know this:
•Greenhouse gases from burning fossil fuels, deforestation, and agriculture have raised atmospheric CO2 to roughly 50% above preindustrial levels, strengthening the greenhouse effect.
•The “fingerprints” match human-caused warming: the lower atmosphere warms while the stratosphere cools; nights and winters warm faster than days and summers; the oceans accumulate vast amounts of heat; the Arctic warms fastest.
•Climate models only reproduce the observed long‑term warming when human influences (greenhouse gases and aerosols) are included; natural drivers alone (solar changes, volcanoes) can’t explain it.
•Multiple independent records (satellites, weather stations, ocean buoys, ice cores) all show consistent warming consistent with human emissions.
Natural variability still affects year‑to‑year and regional conditions, but the long‑term global trend is overwhelmingly driven by us. If you’d like, I can share key sources (IPCC, US National Climate Assessment) or dive into any of the lines of evidence in more detail.