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GPT-5Sep 11, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes
Yes. The warming observed over the last century—especially since the 1970s—is overwhelmingly caused by human activities, primarily:
•Burning fossil fuels and deforestation, which raise atmospheric CO2; methane and nitrous oxide from agriculture, energy, and waste add further warming.
•Land-use changes that alter how Earth reflects and retains heat.
Why scientists are confident:
•The “fingerprints” match human causes: the lower atmosphere warms while the stratosphere cools; nights warm faster than days; winters warm more than summers; oceans accumulate most of the heat.
•Climate models only reproduce the observed long‑term warming when human greenhouse gases are included; natural factors (solar changes, volcanoes) explain little of the trend and sometimes push the opposite way.
•Best estimates attribute essentially all of the net warming since the mid‑20th century to human influence; natural variability mainly adds short‑term ups and downs.
If you’d like, I can share concise sources (e.g., the latest IPCC assessment) or dig into specific contributors like CO2 vs. methane.