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GPT-5Sep 26, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, and the dominant cause of the recent warming is human activity (mainly burning fossil fuels, deforestation, and some industrial/agricultural practices).
Why scientists are confident:
•Physics: Greenhouse gases like CO2 trap heat—this is well-established laboratory and atmospheric physics.
•Measurements: Atmospheric greenhouse gas levels have risen sharply since the Industrial Revolution, and their carbon-isotope “fingerprints” point to fossil fuels.
•Observations: Global air and ocean temperatures are rising; glaciers and ice sheets are losing mass; sea levels are rising; extreme heat and heavy rainfall events are becoming more frequent/severe.
•Fingerprints: The pattern of change—faster warming at night and in the Arctic, cooling of the stratosphere, and increased downward infrared radiation—matches greenhouse-gas forcing, not natural cycles or solar changes.
•Consensus: Every major national academy of science and the IPCC conclude humans are the primary cause of recent climate change.
If you’d like, I can go deeper on any of these points or discuss likely impacts where you live and what actions matter most.