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GPT-5Oct 30, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, and the recent warming is primarily caused by human activities—especially burning fossil fuels and deforestation.
Why we’re confident:
•Basic physics: Greenhouse gases like CO2 and methane trap heat; this has been measured in the lab and from satellites.
•Multiple observations: Rising global air and ocean temperatures, melting glaciers and ice sheets, higher sea levels, earlier springs, and shifting species ranges.
•Clear fingerprints: Nights warming faster than days, the lower atmosphere warming while the stratosphere cools, and increases in heat specifically at CO2-absorbing wavelengths.
•Source tracing: The carbon “fingerprint” (isotopes) shows the added CO2 comes largely from fossil fuels.
•Scientific consensus: Every major national academy of science and the IPCC conclude recent warming is chiefly human-driven.
If you want, I can explain how we know in more detail, discuss likely impacts where you live, or talk about practical solutions.