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GPT-5Sep 24, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. The observed warming over the last century—especially since the mid‑20th century—is overwhelmingly driven by human activities.
What’s doing the warming
•Greenhouse gases from burning fossil fuels (CO2), agriculture and waste (methane), and industry/fertilizers (nitrous oxide).
•Land-use changes like deforestation that reduce the planet’s ability to absorb CO2.
•Some human-made aerosols cool slightly, but not enough to offset greenhouse-gas warming.
How we know
•Fingerprints match: the lower atmosphere warms while the stratosphere cools; nights and winters warm faster than days and summers; land warms more than ocean.
•Carbon “isotopic” signature shows the extra CO2 comes from fossil fuels; atmospheric O2 is declining as carbon is burned.
•Satellites measure less heat escaping to space specifically at CO2 and methane absorption wavelengths.
•Attribution studies consistently find natural factors (solar cycles, volcanoes) cannot explain the magnitude or pattern of recent warming; human influence accounts for essentially all of it.
This is the consensus of major scientific bodies worldwide (e.g., the IPCC and national academies). If you’d like, I can share accessible reports or dig into any of the evidence.