Is climate change real?

Yes, climate change is real.

Multiple independent lines of evidence show that Earth’s climate is warming, primarily due to human activities that increase greenhouse gas concentrations (especially CO₂ from burning fossil fuels, deforestation, and industrial processes).

Key evidence

•Global temperature rise: Instrumental records (thermometers, satellites) show roughly 1.1–1.3°C of warming since the late 19th century, with the past decade the warmest on record. This is confirmed by NASA, NOAA, Hadley Centre/UK Met Office, Berkeley Earth, and others.

•Physical indicators: Shrinking glaciers and ice sheets (Greenland, Antarctica, mountain glaciers), declining Arctic sea ice, rising sea levels (from thermal expansion + meltwater), ocean heat content increase, and shifts in seasonal timing/phenology.

•Atmospheric composition: Direct measurements (e.g., Mauna Loa CO₂ record) and ice-core data show CO₂ has risen from ~280 ppm pre-industrial to over 420 ppm today—levels not seen for millions of years. Isotopic signatures confirm the added carbon is largely from fossil sources.

•Attribution: Climate models that include only natural factors (solar variability, volcanoes) cannot reproduce the observed warming; models that include anthropogenic greenhouse gases match the record. The greenhouse effect itself is basic, long-established physics.

The scientific consensus is extremely strong: assessments by the IPCC, U.S. National Academy of Sciences, and the national academies of virtually every major country conclude that warming is unequivocal and that human influence is the dominant cause of the observed changes since the mid-20th century.

Natural climate variability (orbital cycles, solar output, volcanic aerosols, internal oscillations like ENSO) exists and has driven past changes, but it does not account for the rapid, coherent global warming of the past 150+ years. Claims that “climate is always changing” are true but incomplete—they do not explain the current rate, pattern, or cause.

For primary sources, see IPCC AR6, NASA’s climate page, NOAA’s State of the Climate reports, or the Berkeley Earth temperature analysis.

Is climate change real?

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