Is climate change real?

Yes

Yes, climate change is real. Earth’s climate is warming at an unprecedented rate in recent human history, and human activities—primarily the burning of fossil fuels—are the principal cause.[1]

Key Evidence

Multiple independent lines of evidence confirm this:

•Global temperatures are rising: The planet’s average surface temperature has increased by about 1.1°C (roughly 2°F) since the late 19th century / pre-industrial period (1850–1900), with most of the warming occurring in the past 40–50 years. Recent years have been the warmest on record.[1]

•Ice loss and sea level rise: Greenland and Antarctic ice sheets are losing mass (hundreds of billions of tons per year), Arctic sea ice is declining, glaciers are retreating, and global sea levels are rising due to thermal expansion of seawater and meltwater.[1]

•Ocean and atmospheric changes: Oceans are warming and becoming more acidic as they absorb excess CO₂. The atmosphere shows rising concentrations of greenhouse gases (CO₂, methane, nitrous oxide) with a clear human isotopic fingerprint.[2]

•Extreme weather and impacts: Human-caused climate change is already affecting weather and climate extremes (heatwaves, heavy precipitation, droughts, etc.) in every region. Widespread changes are observed across the atmosphere, ocean, cryosphere, and biosphere.[3]

Paleoclimate data (ice cores, tree rings, sediments) show that the current rate of warming is much faster than natural post-ice-age recoveries, and CO₂ levels are higher than at any point in at least the last 800,000 years.[1]

Scientific Consensus

It is unequivocal that human influence has warmed the atmosphere, ocean, and land. This is the conclusion of the Intergovernmental Panel on Climate Change (IPCC) in its Sixth Assessment Report (AR6) and Synthesis Report.[3]

•Multiple studies of peer-reviewed literature find 97% to greater than 99% agreement among climate scientists that recent warming is primarily human-caused. A 2021 analysis of over 88,000 climate-related papers found >99.9% consensus.[4]

•Leading scientific organizations worldwide—including NASA, NOAA, the National Academies of Sciences, the American Association for the Advancement of Science, and many others—endorse this position.[5]

Natural factors (solar variability, volcanic activity, orbital cycles) cannot explain the observed warming pattern since the mid-20th century. Solar output has been relatively stable or slightly declining while temperatures rose, and the vertical temperature profile (warming lower atmosphere, cooling upper atmosphere) matches greenhouse gas forcing, not solar forcing.[2]

Basic Physics

Greenhouse gases trap heat. Burning fossil fuels, deforestation, and other activities have sharply increased atmospheric CO₂ (from ~280 ppm pre-industrial to over 420 ppm today). This enhanced greenhouse effect is well-understood physics, confirmed by observations and models.[6]

In short, the reality of climate change (global warming driven mainly by human greenhouse gas emissions) is established fact, supported by direct measurements, paleoclimate records, basic physics, and the near-unanimous agreement of the scientific community. Debates continue on precise regional impacts, climate sensitivity details, and the best policy responses, but not on whether it is happening or the primary cause.

Citations (6)

1nasa.govGovernment
https://science.nasa.gov/climate-change/evidence/
Backs: “Earth’s climate is warming at an unprecedented rate in recent human history, and human activities—primarily the burning of fossil fuels—are the principal cause.”
evidence, article, points to yes. Claim: Earth is warming, humans are the principal cause; temperatures up ~1.1°C, ice loss, sea level rise, paleoclimate and CO2 levels evidence.
2nasa.govGovernment
https://science.nasa.gov/climate-change/causes/
Backs: “The atmosphere shows rising concentrations of greenhouse gases (CO₂, methane, nitrous oxide) with a clear human isotopic fingerprint.”
evidence, article, points to yes. Claim: Oceans warming and acidifying, rising greenhouse gases with human isotopic fingerprint; natural factors cannot explain observed warming pattern.
3ipcc.chGovernment
https://report.ipcc.ch/ar6syr/headline.html
Backs: “Widespread changes are observed across the atmosphere, ocean, cryosphere, and biosphere.”
attribution, official document, points to yes. Claim: IPCC AR6 concludes human influence has unequivocally warmed atmosphere, ocean and land, affecting extremes in every region.
4iop.orgAcademic
https://iopscience.iop.org/article/10.1088/1748-9326/ac2966
Backs: “A 2021 analysis of over 88,000 climate-related papers found >99.9% consensus.”
statistic, article, points to yes. Claim: Studies find 97% to over 99% consensus; a 2021 analysis of 88,000 papers found over 99.9% consensus on human-caused warming.
5nasa.govGovernment
https://science.nasa.gov/climate-change/scientific-consensus/
Backs: “Leading scientific organizations worldwide—including NASA, NOAA, the National Academies of Sciences, the American Association for the Advancement of Science, and many others—endorse this position.”
attribution, article, points to yes. Claim: Leading scientific organizations worldwide endorse the position that recent warming is human-caused.
6royalsociety.orgAcademic
https://royalsociety.org/news-resources/projects/climate-change-evidence-causes/
Backs: “This enhanced greenhouse effect is well-understood physics, confirmed by observations and models.”
evidence, article, points to yes. Claim: Enhanced greenhouse effect from CO2 rising from ~280 to over 420 ppm is well-understood physics confirmed by observations.