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GPT-5Sep 19, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. The scientific consensus is that humans are the dominant cause of the warming observed since the mid-20th century.
Why scientists are confident:
•Greenhouse gases have surged due to human activities (burning fossil fuels, deforestation, agriculture). The carbon “fingerprint” (isotopes of carbon) matches fossil-fuel sources.
•The planet shows the expected physical “fingerprints” of greenhouse warming: the lower atmosphere and oceans are warming while the stratosphere cools; nights and winters warm slightly faster than days and summers; land warms faster than oceans; polar regions (especially the Arctic) warm most.
•Satellite and surface measurements show less heat escaping to space specifically at CO2 and methane absorption wavelengths.
•Climate models only reproduce the observed warming trend when human emissions are included; natural factors alone (solar variability, volcanoes) can’t explain it and would likely have led to little warming—or slight cooling—over recent decades.
•Most of the excess heat is accumulating in the oceans, consistent with a sustained radiative imbalance driven by greenhouse gases.
If you’d like, I can share accessible summaries (e.g., the latest IPCC and U.S. National Climate Assessment) or dive into any line of evidence in more detail.