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GPT-5Sep 15, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. The evidence is overwhelming that Earth’s climate is warming and that humans—mainly through burning fossil fuels and deforestation—are the primary cause.
Key points:
•Basic physics: Greenhouse gases like CO2 and methane trap heat. Human activities have raised their concentrations sharply since the 1800s.
•Measured changes: Global average temperature has risen by roughly 1.1–1.3°C since the late 19th century; oceans are storing more heat; sea level is rising; glaciers and ice sheets are losing mass; and many heatwaves, heavy downpours, and wildfires are becoming more frequent or intense.
•Fingerprints: The pattern of warming (more at night and over land, cooling upper atmosphere while the surface warms) and the carbon isotopic “signature” point to fossil fuels as the main driver.
•Scientific consensus: National academies and major scientific societies worldwide, and assessments like the IPCC, agree on these conclusions.
If you’d like, I can walk through specific lines of evidence, address common misconceptions, or discuss impacts/solutions where you live.