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GPT-5Oct 11, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, it’s already happening, and the dominant cause since the mid‑20th century is human emissions of greenhouse gases (mainly CO2, methane, and nitrous oxide).
How we know:
•Thermometers show a sustained global warming trend of a bit over 1°C since the late 1800s, with the last decade the warmest in the instrumental record.
•Oceans are absorbing most of the excess heat; sea level is rising from thermal expansion plus melting glaciers and ice sheets.
•Ice is retreating worldwide (Arctic sea ice, mountain glaciers), growing seasons are shifting, and many species’ ranges are moving poleward/upward.
•Extremes are changing: heat waves are more frequent/intense, heavy rainfall events are increasing in many regions, and wildfire‑favorable conditions are becoming more common.
•Fingerprints match human causes: the lower atmosphere warms while the stratosphere cools; CO2’s isotopes trace to fossil fuels; satellites measure reduced heat escaping at the wavelengths CO2 and methane absorb; only models that include human emissions reproduce the observed warming.
If you’d like, I can point you to clear, nontechnical explainers (e.g., NASA, NOAA, IPCC) or summarize expected impacts where you live.