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GPT-5Oct 20, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes.
Why scientists are sure:
•Measured warming: Earth has warmed about 1.1°C (2.0°F) since the late 1800s. Oceans are storing record heat, sea level has risen ~8–9 inches since 1900, and Arctic summer sea ice and glaciers are shrinking.
•Greenhouse gases: CO2 is now over 420 ppm (about 280 ppm before the Industrial Revolution). Physics established since the 1800s shows more CO2, methane, etc., trap more heat.
•Fingerprints: The lower atmosphere warms while the stratosphere cools; nights and winters warm faster than days and summers; more heatwaves and heavy downpours—patterns expected from greenhouse warming.
•Natural factors tested: Solar output trends and volcanoes can’t explain the long-term warming or its geographic/seasonal patterns; only human emissions do.
This is the conclusion of every major national academy of science and the IPCC. If you want, I can share clear, accessible sources or answer specific doubts you’ve heard.