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GPT-5Sep 28, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, and the planet is warming. Multiple independent lines of evidence show this:
•Instrument records: Global air and ocean temperatures have risen markedly since the late 1800s; the oceans hold most of the excess heat.
•Cryosphere changes: Glaciers and ice sheets are losing mass; Arctic sea ice is declining.
•Sea level: Global mean sea level is rising from warming oceans and melting ice.
•Extremes and ecosystems: Heatwaves are becoming more frequent and intense; heavy rainfall events are increasing; seasons and species ranges are shifting.
It’s primarily caused by humans. Greenhouse gases from burning fossil fuels and deforestation trap heat. We know this from:
•Measured increases in CO2, with an isotopic “fingerprint” of fossil fuels.
•The vertical pattern of warming (lower atmosphere warming, stratosphere cooling) expected from greenhouse gases.
•Climate models and observations: the recent warming cannot be explained by natural factors alone.
Weather is day-to-day; climate is the long-term pattern. The long-term trend is clear: the climate is changing, and humans are the main driver. If you’d like, I can share accessible sources (e.g., IPCC, NASA, NOAA) or dive into any part in more detail.