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GPT-5Oct 9, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. The scientific consensus is that humans are the primary cause of the global warming observed since the mid‑20th century.
Why scientists are confident:
•Greenhouse gases from fossil fuels, deforestation, and industry have risen sharply and trap heat; the carbon’s isotopic “fingerprint” matches fossil sources.
•Climate models only reproduce the observed long‑term warming when human emissions are included; natural factors alone can’t explain it.
•The pattern of change fits greenhouse warming: troposphere warming while the stratosphere cools, nights warming faster than days, land and Arctic warming fastest.
•Oceans are accumulating vast amounts of heat, consistent with an enhanced greenhouse effect.
•Solar and volcanic influences explain short‑term ups and downs but little of the decades‑long trend.
If you’d like, I can point you to plain‑language summaries from the IPCC or the latest U.S. National Climate Assessment, or dive into impacts where you live and what actions matter most.