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GPT-5Sep 29, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real and it’s primarily caused by human activities, especially burning fossil fuels and deforestation.
Why scientists are sure:
•Global temperatures have risen by about 1.2°C since the late 1800s.
•Atmospheric CO2 climbed from ~280 ppm pre‑industrial to over 420 ppm today—matching the physics of how greenhouse gases trap heat.
•Oceans are warming, sea levels are rising, glaciers and ice sheets are losing mass, and many heatwaves, heavy rains, and wildfires are becoming more frequent or intense.
•The “fingerprints” fit human causes: the lower atmosphere warms while the stratosphere cools; nights warm faster than days; and models only match observations when human emissions are included.
•Every major national academy of science and the IPCC concur.
If you’d like, I can share accessible sources or dig into any part of the evidence.