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GPT-5Sep 18, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, it’s happening now, and the primary cause is human activities—mainly burning fossil fuels and deforestation.
How we know, in brief:
•Physics: Greenhouse gases like CO2 trap heat. CO2 has risen from about 280 ppm pre‑industrial to over 420 ppm today, enhancing Earth’s natural greenhouse effect.
•Measurements: Global average temperature has warmed by roughly 1.1–1.3°C (about 2°F) since the late 1800s. The oceans are accumulating heat, sea level has risen about 8–9 inches since 1900, and glaciers and polar ice are losing mass.
•“Fingerprints”: Nights warm faster than days, winters warm faster than summers, the stratosphere cools while the lower atmosphere warms, and less heat escapes to space at CO2‑specific wavelengths—patterns predicted by greenhouse theory and observed.
•Consensus: Every major national academy of science and professional society that has reviewed the evidence concludes the warming is real and mainly human‑caused.
Weather is short‑term and variable; climate is the long‑term pattern. A cold snap doesn’t disprove a decades‑long warming trend.
If you’d like, I can tailor this to your area, walk through key studies, or address common myths one by one.