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GPT-5Oct 10, 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.
Why scientists are sure:
•Global average temperature has risen by about 1.2°C (2.2°F) since the late 1800s.
•Atmospheric CO2 has increased roughly 50% (from ~280 ppm preindustrial to over 420 ppm today), trapping more heat.
•Oceans are warming, sea level has risen about 8 inches (≈20 cm) since 1900, and the rate is accelerating.
•Glaciers and Arctic sea ice are shrinking, and the “fingerprints” match greenhouse-gas warming (e.g., stratosphere cooling while the surface warms).
This conclusion is supported by the IPCC and every major national science academy. If you’d like, I can share sources or dive into any part in more detail.