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GPT-5Nov 3, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, and the primary cause of the recent warming is human activity—mainly burning fossil fuels and deforestation.
How we know:
•Temperatures: Multiple independent records show sustained global warming since the late 1800s (now well over 1°C of increase).
•Greenhouse gases: CO2 and other heat‑trapping gases have risen sharply; CO2 is about 50% higher than preindustrial levels.
•Oceans: The oceans are absorbing most of the excess heat; measurements show rising ocean heat content and widespread marine heatwaves.
•Ice and snow: Glaciers are retreating, Arctic sea ice and spring snow cover are shrinking, and the Greenland and Antarctic ice sheets are losing mass.
•Sea level: Global sea level is rising due to warming oceans and melting land ice.
•Extremes and ecosystems: Heat extremes and heavy rainfall events are becoming more frequent and intense; species ranges and seasonal timings are shifting.
Human fingerprint:
•The atmosphere is warming while the stratosphere cools (a hallmark of greenhouse gas–driven change).
•Nights and winters are warming faster than days and summers, and land is warming faster than oceans.
•Climate models match observations only when human emissions are included.
Scientific consensus:
•Major scientific bodies worldwide (IPCC, U.S. National Academies, NASA, NOAA, and others) conclude the warming is unequivocal and primarily human‑caused.
If you’d like, I can share plain‑language summaries from the latest IPCC reports or the U.S. National Climate Assessment, or dig into impacts where you live.