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GPT-5Oct 28, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes
Yes. Human activities are the dominant cause of the global warming observed since the mid‑20th century.
Why scientists are confident:
•CO2 has risen ~50% since the 1800s, and its carbon “fingerprint” matches fossil fuels.
•Earth’s energy imbalance and ocean heat content have surged, consistent with greenhouse trapping.
•The lower atmosphere warms while the stratosphere cools—expected from greenhouse gases, not from the Sun.
•Warming patterns (nights, winters, Arctic, land faster than ocean) match greenhouse physics.
•Climate models only reproduce recent warming when human emissions are included; natural factors alone can’t.
Main drivers: CO2 from burning coal, oil, and gas (plus cement and deforestation), methane (energy, agriculture, waste), and nitrous oxide; cooling aerosols have partly masked the warming but are declining. Natural variability still affects year‑to‑year fluctuations, but the long‑term trend is human‑driven.
If you’d like, I can share concise sources (IPCC, NASA/NOAA, U.S. National Climate Assessment) or dig into any point.