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GPT-5Oct 17, 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 recent, rapid warming of Earth’s climate.
Why scientists are confident:
•Greenhouse gases: Burning fossil fuels, deforestation, and some farming practices raise CO2, methane, and nitrous oxide, which trap heat. CO2 is now about 50% higher than preindustrial levels.
•Fingerprints: The lower atmosphere warms while the stratosphere cools; nights and winters warm faster than days/summers; the Arctic warms quickest; oceans gain heat. These patterns match greenhouse-gas warming and not solar or volcanic changes.
•Accounting and models: Only when human emissions are included do climate models reproduce the observed 20th–21st century warming; natural factors alone can’t.
•Independent measurements: Satellites show an energy imbalance at the top of the atmosphere; ocean heat content and sea level are rising, consistent with human-caused warming.
If you’d like, I can share key sources (e.g., recent IPCC assessments) or dive deeper into any of these points.