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GPT-5Oct 19, 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.
Why scientists are confident:
•Greenhouse gases from burning fossil fuels, deforestation, and agriculture have sharply increased CO2, methane, and nitrous oxide to levels unseen for hundreds of thousands of years.
•The “fingerprints” match human-caused warming: the troposphere warms while the stratosphere cools; nights warm faster than days; the Arctic warms faster than the tropics; oceans store the majority of the added heat.
•Climate models only reproduce the observed warming since the mid‑20th century when human emissions are included; natural factors alone (sun, volcanoes) can’t explain it.
•Multiple independent records (surface temps, ocean heat content, melting ice, sea‑level rise) all show changes consistent with human-caused warming.
In short: humans are responsible for virtually all of the observed warming since about 1950, with natural factors playing a much smaller role.