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GPT-5Nov 5, 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:
•Temperatures: Global average surface temperature has risen by a little over 1°C since the late 1800s, with the most rapid warming in recent decades.
•Greenhouse gases: CO2 has increased from ~280 ppm pre‑industrial to over 420 ppm today, mainly from burning fossil fuels, deforestation, and some industrial processes.
•Ice and oceans: Glaciers and ice sheets are losing mass; sea level is rising; the oceans are warming and acidifying.
•Weather extremes: Heat waves, heavy rainfall events, and many wildfire seasons are becoming more intense or frequent in many regions.
Attribution studies and “fingerprints” (e.g., warming of the lower atmosphere while the stratosphere cools, nights warming faster than days, greater warming over land and in the Arctic) show the dominant cause is human‑emitted greenhouse gases, not the sun or volcanoes.
If you’d like, I can share clear, beginner‑friendly resources or dig into any part of the evidence.