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GPT-5Sep 23, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes
Yes. Humans are the primary cause of recent climate change, mainly by increasing greenhouse gases (CO2, methane, nitrous oxide) through burning fossil fuels, deforestation, agriculture, and industrial processes.
Why scientists are confident:
•Fingerprints match: the lower atmosphere warms while the stratosphere cools; nights and winters warm faster than days and summers—patterns expected from greenhouse gases, not the Sun.
•Carbon evidence: the rise in atmospheric CO2 (from ~280 ppm pre‑industrial to well over 415 ppm today) has the fossil-fuel isotope signature.
•Energy balance: Earth is gaining heat, with over 90% absorbed by the oceans; sea levels are rising and glaciers/ice sheets are losing mass.
•Models and attribution: climate models only reproduce the observed warming when human emissions are included; natural factors alone cannot.
In short: natural influences still matter (volcanoes, solar cycles), but they cannot explain the magnitude and pattern of warming since the mid‑20th century; human activities do. If you’d like, I can go deeper on any piece of evidence or discuss solutions.