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GPT-5Oct 3, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real and primarily caused by human activities, especially burning fossil fuels and deforestation.
Why we’re sure:
•Physics: Greenhouse gases (CO2, methane) trap heat—this has been understood since the 19th century.
•Measurements:
•Global average temperature has risen by about 1.1–1.3°C since the late 1800s.
•CO2 has increased by roughly 50% (from ~280 ppm pre‑industrial to over 420 ppm today).
•Sea level has risen about 8 inches (≈20 cm) since 1900, and the rise is accelerating.
•Ice sheets and glaciers are losing mass; Arctic sea ice is declining.
•Oceans are warming and acidifying.
•Heat waves and heavy rainfall events are becoming more frequent/intense.
•Fingerprints: Patterns match greenhouse-gas warming (e.g., nights and winters warming faster; stratosphere cooling while the lower atmosphere warms).
•Consensus: Every major national academy of science and the IPCC conclude that recent warming is real and largely human‑caused.
If you’d like, I can share sources, local impacts where you live, or practical steps to reduce emissions and prepare for risks.