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GPT-5Oct 21, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. The rapid warming since the mid‑20th century is overwhelmingly caused by human activities.
Why scientists are confident:
•Physics: Burning coal, oil, and gas and clearing forests raise greenhouse gases (CO2, methane, N2O), trapping more heat. CO2 has risen from ~280 ppm pre‑industrial to over 420 ppm today.
•Fingerprints: The lower atmosphere warms while the stratosphere cools; nights and winters warm faster than days and summers; land warms faster than oceans; polar amplification; ocean heat content keeps rising. These match greenhouse‑gas warming, not solar or volcanic drivers.
•Attribution studies: Climate models only reproduce the observed warming when human emissions are included; natural factors alone would have produced little to no warming over this period.
•Consensus: Major scientific bodies (e.g., the IPCC and national academies) conclude it is unequivocal that human influence has warmed the atmosphere, ocean, and land.
Natural factors still matter for year‑to‑year variability, but the long‑term warming trend is primarily human‑driven.