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GPT-5Sep 14, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes
Yes. The overwhelming scientific consensus is that humans are the primary cause of the warming observed since the mid‑20th century.
Why scientists are confident:
•Mechanism: Burning fossil fuels, deforestation, and some industrial/agricultural practices raise atmospheric CO2, methane, and nitrous oxide, increasing the greenhouse effect. Aerosols cool a bit, but not enough to offset the warming.
•Fingerprints: The pattern matches greenhouse-gas warming—troposphere warming with stratosphere cooling; nights/winters warming faster than days/summers; more ocean heat content; Arctic amplification; and the carbon‑isotope “signature” of fossil fuels in the extra CO2.
•Attribution studies: When models include human emissions, they reproduce the observed warming; with only natural factors (solar/volcanoes), they do not. Results consistently find humans responsible for essentially all of the net global warming since about 1950.
If you’d like, I can share the key findings from the IPCC and the U.S. National Climate Assessment or explain any of the lines of evidence in more detail.