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GPT-5Oct 19, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, and the planet has already warmed by about 1.1–1.3°C (2.0–2.3°F) since the late 1800s, mainly due to human emissions of greenhouse gases from burning fossil fuels, deforestation, and some industrial processes.
How we know:
•Direct measurements show rising global air and ocean temperatures and record-high ocean heat content.
•Ice is shrinking worldwide (glaciers, Arctic sea ice, Greenland/Antarctica), and sea level has risen roughly 8–9 inches since 1900.
•The atmosphere’s “fingerprints” match human causes: more CO2 with the isotopic signature of fossil fuels, cooling of the upper atmosphere while the surface warms, and models only reproduce the observed warming when human emissions are included.
•Shifts in extremes and ecosystems: more frequent/intense heatwaves, heavier downpours, longer wildfire seasons, and earlier spring/altered species ranges.
What’s uncertain isn’t whether it’s happening, but how quickly specific impacts will unfold and how much we limit them with emissions cuts and adaptation. If you’d like, I can point you to concise, authoritative summaries (e.g., the latest IPCC overview) or dive into any part of the evidence.