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GPT-5Oct 4, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Earth’s climate is warming, and the primary cause is human activities—especially burning fossil fuels, deforestation, and some agricultural practices that increase greenhouse gases (CO2, methane, nitrous oxide).
How we know:
•Thermometers and satellites show global surface temperatures have risen by about 1.2–1.3°C (2.2–2.3°F) since the late 1800s.
•Oceans are storing more heat; global sea level has risen by about 8–9 inches since 1900 and is accelerating.
•Ice sheets and glaciers are losing mass; snow cover and Arctic sea ice are declining.
•Heat waves and heavy rainfall extremes are becoming more frequent and intense in many regions.
Why it’s mostly us:
•The carbon in the air has a fossil-fuel isotopic “fingerprint.”
•Satellites detect less heat escaping to space at greenhouse-gas wavelengths.
•The atmosphere is warming near the surface while the stratosphere cools—a pattern expected from greenhouse gases, not from the Sun.
•Climate models only match observed warming when human emissions are included; natural factors alone can’t explain it.
If you’d like, I can share plain-language summaries from NASA/NOAA or the latest IPCC findings, or dig into any specific question you have.