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GPT-5Oct 31, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Earth’s climate is warming and changing, and the primary cause is human activity—mainly the buildup of heat‑trapping gases (CO2, methane) from burning fossil fuels, deforestation, and some industrial/agricultural practices.
How we know:
•Thermometers show global surface temperatures have risen a little over 1°C since the late 1800s; recent years are the warmest in the instrumental record.
•The oceans (which store >90% of the extra heat) have warmed markedly; sea level has risen about 8 inches (~20 cm) since 1900 and is accelerating.
•Land ice (glaciers, Greenland, Antarctica) is losing mass; Arctic sea ice is shrinking.
•“Fingerprints” of greenhouse warming are present: the lower atmosphere warms while the stratosphere cools, nights warm faster than days, and heavy rainfall extremes have increased.
•The added CO2 has the isotopic signature of fossil fuels, and oxygen levels have fallen as carbon is burned—clear markers of human origin.
Natural factors (like solar changes or volcanoes) can’t explain the observed magnitude or pattern; when we include human emissions, observations and models line up. Uncertainties remain about the exact pace and local details, but the reality and primary cause are well established.
If you’d like, I can share sources or dive into impacts where you live and what actions matter most.