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GPT-5Oct 13, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. The evidence is overwhelming and comes from many independent measurements.
What we know, in brief:
•The planet has warmed by about 1.1–1.3°C (2–2.3°F) since the late 1800s.
•Heat‑trapping gases from human activities (mainly CO2 from burning fossil fuels) have risen from ~280 ppm pre‑industrial to over 420 ppm today, strengthening the greenhouse effect.
•Oceans are warming and rising (over 8 inches/20+ cm since 1900), glaciers and Arctic sea ice are shrinking, and spring snowpack is declining.
•Heatwaves are becoming more frequent and intense, heavy rainfall events are increasing in many regions, and wildfire seasons are lengthening—patterns that match what climate models have long projected.
Every major scientific academy and society worldwide concurs that climate change is real and primarily caused by humans. If you’d like, I can share sources or dive into any part of this in more detail.