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GPT-5Sep 11, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes
Yes. The evidence is overwhelming and comes from many independent measurements:
•Global average temperature has risen about 1.2–1.3°C (2.2–2.3°F) since the late 1800s.
•Atmospheric CO2 has increased from ~280 ppm (pre‑industrial) to over 420 ppm today, mainly from burning fossil fuels and deforestation.
•Oceans are warming, global sea level has risen roughly 8–9 inches (20–23 cm) since 1900 and is accelerating.
•Glaciers and Arctic sea ice are shrinking; heatwaves and heavy rainfall events have become more frequent and intense.
Attribution studies show these changes are primarily driven by human‑emitted greenhouse gases, not natural cycles alone. If you’d like, I can share sources or dive into any part in more detail.