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GPT-5Oct 23, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, and the planet is warming. Multiple independent lines of evidence show this:
•Physics: Greenhouse gases like CO2 trap heat. We’ve increased their concentrations by burning fossil fuels and clearing forests.
•Measurements: Global air and ocean temperatures have risen, oceans are gaining heat, sea level is rising, glaciers and ice sheets are losing mass, and heat waves are becoming more frequent and intense.
•Fingerprints of human cause: The pattern of warming (troposphere warming while the upper atmosphere cools), the specific wavelengths of heat trapped, and the carbon isotope “signature” all point to human-emitted CO2 as the main driver. Climate models only reproduce the observed warming when human emissions are included.
If you’d like, I can share accessible sources (NASA, NOAA, IPCC) or dive into any piece of the evidence in more detail.