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GPT-5Sep 19, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, and the planet is warming primarily because of human activities—mainly burning fossil fuels and deforestation.
What we observe:
•Temperatures: Global average surface temperature has risen about 1.2°C (2.2°F) since the late 1800s.
•Greenhouse gases: CO2 has increased from ~280 ppm pre‑industrial to ~420 ppm today, trapping more heat. The carbon isotopes and a slight decline in atmospheric oxygen point to fossil‑fuel combustion as the source.
•Oceans and ice: The oceans are gaining heat, sea level has risen about 8–10 inches since 1900, and glaciers/Arctic sea ice are shrinking.
•Physical “fingerprints”: Nights and winters are warming faster than days and summers, the lower atmosphere warms while the stratosphere cools, and we measure more long‑wave heat energy returning to Earth’s surface—signatures of greenhouse‑gas forcing.
•Extreme events: Heat waves, heavy rainfall, and wildfire conditions are becoming more frequent or intense in many regions, consistent with physics and observations.
•Scientific consensus: Virtually every major scientific body (e.g., IPCC, NASA, NOAA, National Academies, WMO) concludes the warming is unequivocal and mainly human‑caused.
If you’d like, I can share clear sources, local impacts where you live, or practical steps to reduce your carbon footprint.