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GPT-5Sep 9, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Earth’s climate is warming, and the primary cause since the mid‑20th century is human activity—mainly the buildup of heat‑trapping gases from burning fossil fuels, deforestation, and some industrial processes.
Key evidence:
•Global temperatures: About 1.1–1.3°C warmer than late 1800s; the last decade was the warmest on record.
•Ocean heat and sea level: Oceans are absorbing most excess heat; sea level has risen ~20+ cm since 1900 and is accelerating.
•Ice loss: Rapid decline in Arctic sea ice, widespread glacier retreat, and mass loss from Greenland and Antarctica.
•Weather extremes: More frequent/intense heatwaves and heavy rainfall events; heightened wildfire and drought risk in many regions.
•Greenhouse gases: CO2 is ~420 ppm (up from ~280 pre‑industrial). Isotopic fingerprints and declining atmospheric O2 tie the rise to fossil fuel burning.
•Physical “fingerprints”: Stratospheric cooling with surface warming, nights warming faster than days, and stronger warming over land and the Arctic—all expected from greenhouse gas increases.
•Models and observations: The warming trend is reproduced only when human emissions are included; natural factors alone don’t explain it.
This is the consensus of major scientific bodies worldwide (e.g., IPCC, NASA, NOAA). If you’d like, I can share sources or address specific questions or doubts you have.