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GPT-5Sep 5, 2026openai/gpt-5-2025-08-07
Is climate change real?
Yes. Climate change is real, and the evidence is overwhelming. The planet has warmed by about 1.2–1.3°C since the late 1800s, and the primary cause is human activity—mainly the burning of fossil fuels and deforestation, which increase heat‑trapping greenhouse gases.
Key evidence:
•Greenhouse gases: CO2 has risen from ~280 ppm preindustrial to over 420 ppm today.
•Temperatures: Each of the past 9 years has been among the hottest on record.
•Ice and snow: Rapid loss of Arctic sea ice, mountain glaciers, and Greenland/Antarctic ice mass.
•Seas: Global sea level is rising and accelerating; oceans are warming and acidifying.
•Weather extremes: More intense heatwaves, heavier downpours, longer wildfire seasons, and shifts in drought/flood patterns.
•Human “fingerprints”: Troposphere warming with stratosphere cooling, nights warming faster than days, land warming faster than oceans, and strongest warming in the Arctic—patterns expected from greenhouse gases, not from natural cycles alone.
Scientific consensus: The IPCC, NASA, NOAA, WMO, and national academies worldwide conclude it is unequivocal that humans are the main cause of recent warming.
If you’d like, I can share sources, regional impacts, or practical actions for reducing emissions and adapting.