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GPT-5Nov 8, 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 current warming of Earth’s climate.
Why scientists are confident:
•Greenhouse gases have risen sharply from burning fossil fuels, deforestation, and agriculture. The chemical “fingerprint” of the extra CO2 matches fossil-fuel carbon, and the timing tracks industrial activity.
•The pattern of change fits physics: the lower atmosphere and surface warm while the stratosphere cools; nights and winters warm faster than days and summers; the oceans accumulate most of the excess heat.
•Climate models only reproduce the observed long‑term warming when human influences (greenhouse gases and aerosols) are included; natural factors alone (solar variability, volcanoes) cannot explain it.
•Independent measurements agree: rising ocean heat content, sea‑level rise from thermal expansion and melting ice, retreating glaciers, and earlier seasonal events all align with human‑driven warming.
Attribution studies find that essentially all of the net global warming since the mid‑20th century is due to human activities; natural factors made little difference on the multi‑decadal trend.