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GPT-5Sep 22, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
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:
•Greenhouse gases: Burning fossil fuels, deforestation, cement production, and agriculture have sharply increased CO2, methane, and nitrous oxide. The carbon “fingerprint” (isotopes) shows much of the added CO2 comes from fossil fuels.
•Earth’s energy imbalance: Satellites and ocean measurements show the planet is trapping more heat, with most excess heat stored in the oceans.
•Distinct fingerprints: The lower atmosphere warms while the stratosphere cools; nights and winters warm faster than days and summers; land and the Arctic warm faster than the global average—patterns expected from greenhouse-gas forcing, not from the Sun.
•Modeling and attribution: Climate models only match observed warming when human emissions are included; natural drivers alone would yield little warming or even slight cooling over recent decades.
In short: humans are responsible for essentially all of the recent global warming, with natural factors playing a minor role.