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GPT-5Oct 25, 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 recent global warming—responsible for essentially all of the net warming since the mid‑20th century—mainly from burning fossil fuels, deforestation, and certain industrial/agricultural practices that raise CO2, methane, and nitrous oxide.
Why scientists are confident:
•Fingerprints: The troposphere warms while the stratosphere cools; nights and winters warm faster than days and summers; land warms faster than ocean—patterns expected from greenhouse gases, not the Sun.
•Carbon clues: The rising CO2 has the isotopic signature of fossil fuels, and atmospheric O2 is declining as carbon is burned.
•Energy imbalance: Satellites and ocean measurements show Earth taking in more energy than it emits; most excess heat is accumulating in the oceans.
•Models vs. observations: Climate models only match observed 20th–21st century warming when human greenhouse gases are included; natural factors alone can’t explain it.
•Scale and rate: Today’s rapid warming greatly exceeds what known natural drivers would produce over such short timescales.
If you’d like, I can share key sources or dive into any of these lines of evidence.