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GPT-5Sep 26, 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 increased sharply (CO2 now well over preindustrial levels), strengthening Earth’s heat‑trapping blanket.
•“Fingerprints” match human causes: the lower atmosphere warms while the stratosphere cools; nights and winters warm faster than days and summers; the Arctic warms faster than the globe; oceans store most of the added heat.
•Climate models only reproduce the observed warming when human emissions are included; natural factors alone (solar changes, volcanoes) can’t explain the trend since the mid‑20th century.
•Carbon’s isotopic signature in the air and oceans shows it comes mainly from fossil fuels.
•Natural variability (like El Niño/La Niña) explains short‑term ups and downs, not the long‑term rise.
If you’d like, I can share plain‑language summaries from the IPCC, NASA/NOAA, or the U.S. National Academies.