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GPT-5Oct 29, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes
Yes. The overwhelming scientific consensus is that humans are the dominant cause of the rapid warming observed since the mid‑20th century.
Why scientists are confident:
•Greenhouse gases have surged from burning fossil fuels, deforestation, and agriculture; the carbon’s isotopic “fingerprint” matches fossil sources.
•The atmosphere shows the expected pattern of greenhouse warming: the lower atmosphere warms while the stratosphere cools—something rising sun output wouldn’t produce.
•Nights and winters have warmed faster than days and summers, another greenhouse signature.
•The oceans (which absorb >90% of excess heat) are warming, and sea level is rising from thermal expansion and melting ice.
•Climate models only match the observed warming when human influences are included; natural drivers alone can’t explain it.
How much is human-caused:
•Essentially all of the net global warming since about 1950 is attributable to human activities; natural factors would have produced little change or even slight cooling over that period.
Main culprits:
•Carbon dioxide (from coal, oil, gas, and deforestation) is the largest driver, followed by methane (fossil gas leaks, livestock, rice), nitrous oxide (fertilizers), and industrial gases.
If you’d like, I can share accessible sources or dig into specific regions, risks, or solutions.