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GPT-5Oct 30, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. The overwhelming scientific consensus is that humans are the primary cause of the global warming observed since the mid‑20th century.
What’s driving it
•Greenhouse gases from burning fossil fuels (coal, oil, gas), plus deforestation and some industrial agriculture (mainly CO2, CH4, N2O).
How we know
•Carbon “fingerprints”: the isotopic makeup of atmospheric CO2 matches fossil‑fuel sources.
•Atmospheric pattern: the lower atmosphere warms while the stratosphere cools; nights warm faster than days; land warms faster than oceans—signatures expected from greenhouse gases, not the Sun.
•Energy measurements: rising ocean heat content and increased downward longwave radiation.
•Models and attribution studies: only simulations that include human emissions reproduce the observed warming; natural factors alone don’t.
•Context: CO2 is far above preindustrial levels (~280 ppm then vs ~420 ppm today) and higher than at least the past 800,000 years; warming since the late 1800s is about 1.1°C, with humans responsible for essentially all of it.
If you’d like, I can share clear, nontechnical sources or dive deeper into any line of evidence.