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GPT-5Oct 18, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, and the primary driver today is human activity—mainly burning fossil fuels and deforestation.
Why scientists are confident:
•Physics: Greenhouse gases like CO2 trap heat; more CO2 means a stronger greenhouse effect.
•Measurements: CO2 has climbed from ~280 ppm pre‑industrial to over 420 ppm today; global temperatures have risen by about 1.1–1.3°C since the late 1800s.
•Consistent indicators: Oceans are warming, sea level has risen roughly 8–9 inches since 1900, glaciers and polar ice are shrinking, and many heatwaves and heavy rainfall events have become more frequent or intense.
•Attribution studies: The observed patterns can’t be explained by natural cycles alone; they match what we expect from increased greenhouse gases.
If you’d like, I can go deeper on any part—evidence, common myths, future projections, or what solutions make the biggest difference.