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GPT-5Sep 16, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real and the dominant cause is human activity, especially burning fossil fuels and deforestation.
Key evidence:
•Basic physics: Greenhouse gases like CO2 and methane trap heat; this has been measured in the lab for over a century.
•Rising concentrations: CO2 has climbed from about 280 ppm pre‑industrial to over 420 ppm today.
•Warming trend: Global surface temperatures have risen by a little over 1°C since the late 1800s, with the last decade the warmest on record.
•Consistent observations: Oceans are heating, sea level is rising, glaciers and Arctic sea ice are shrinking, and heat waves are becoming more frequent and intense.
•Fingerprints of human cause: The lower atmosphere warms while the stratosphere cools, nights warm faster than days, and isotopes of carbon match fossil‑fuel sources—patterns natural cycles can’t explain.
•Attribution studies: Independent analyses show that virtually all of the warming since the mid‑20th century is due to human emissions, not the sun or volcanoes.
If you’d like, I can tailor impacts to your region or suggest the most effective actions individuals, companies, and governments can take.