Is climate change real?

Yes

Yes, climate change is real. The Earth’s climate is warming at an unprecedented rate in recent millennia, and human activities—primarily the emission of greenhouse gases like carbon dioxide (CO₂) from burning fossil fuels—are the principal cause. This is established scientific fact, supported by multiple independent lines of evidence and an overwhelming consensus among climate scientists and major scientific organizations.[1]

Scientific Consensus

•Multiple studies of peer-reviewed literature show that 97% or more (with recent analyses reaching over 99.9%) of climate scientists and climate-related papers agree that humans are causing global warming.[2]

•Organizations including NASA, the Intergovernmental Panel on Climate Change (IPCC), the U.S. National Academies of Sciences, the Royal Society, and academies of science from dozens of countries endorse this position.[3]

•The IPCC’s Sixth Assessment Report (AR6) states that human activities have unequivocally caused global warming, with global surface temperature reaching about 1.1°C above 1850–1900 levels in 2011–2020.[4]

Key Evidence

NASA and other agencies summarize compelling observational evidence:[1]

•Rising global temperatures: Average surface temperature has risen about 1–1.3°C (roughly 2°F) since the late 19th/early 20th century, with most warming in recent decades. Recent years have been among the warmest on record.[3]

•Ocean warming: The oceans have absorbed much of the excess heat (about 90% of it), with the top layers warming significantly.

•Melting ice and snow: Greenland and Antarctic ice sheets are losing mass (hundreds of billions of tons per year); glaciers are retreating worldwide; Arctic sea ice extent and thickness have declined rapidly; Northern Hemisphere spring snow cover is decreasing.

•Sea level rise: Global sea level has risen about 20–24 cm (8–9 inches) since 1880, with the rate accelerating.

•Other changes: Increasing frequency of extreme heat events and heavy precipitation in many regions; ocean acidification (surface waters ~30% more acidic due to absorbed CO₂); shifts in species ranges.

Paleoclimate data (ice cores, tree rings, sediments, etc.) show the current warming rate is much faster than natural post-ice-age recoveries, and atmospheric CO₂ is rising ~250 times faster than natural rates after the last Ice Age. The isotopic “fingerprint” of the added CO₂ matches fossil fuel sources.[1]

Causes

Basic physics of the greenhouse effect (known since the 19th century) explains it: Greenhouse gases trap heat. Human emissions have sharply increased atmospheric CO₂ (and methane, nitrous oxide, etc.) since the Industrial Revolution, enhancing this effect.[5]

•Natural factors (solar variability, volcanoes, orbital cycles) cannot explain the observed warming pattern. Satellite data show little to no net increase in solar output recently, while temperatures rose. The vertical temperature profile (warming in the lower atmosphere/troposphere, cooling in the stratosphere) matches greenhouse gas forcing, not solar or other natural drivers.[3]

•Climate models that include human forcings reproduce the observed changes; those with only natural factors do not.

Climate has always varied naturally, but the current change is rapid, primarily human-driven, and occurring on top of a relatively stable Holocene climate that enabled civilization. Even a few degrees of additional warming carries significant risks for weather extremes, ecosystems, sea levels, and human systems.[3]

In short, the reality of human-caused climate change is as solidly established as other major scientific conclusions (e.g., the link between smoking and cancer or the role of plate tectonics). Ongoing research refines details, projections, and regional impacts, but the core facts are not in serious scientific dispute. For primary sources, see NASA’s climate pages, IPCC reports, and the Royal Society/National Academy of Sciences “Climate Change: Evidence & Causes.”

Citations (5)

1nasa.govGovernment
https://science.nasa.gov/climate-change/evidence/
Backs: “This is established scientific fact, supported by multiple independent lines of evidence and an overwhelming consensus among climate scientists and major scientific organizations.”
evidence, article, points to yes. Claim: Climate is warming at unprecedented rate, human activity is principal cause, supported by multiple independent lines of evidence and consensus; also paleoclimate and isotopic fingerprint evidence.
2skepticalscience.comNonprofits and think tanks
https://skepticalscience.com/print.php?r=42
Backs: “Multiple studies of peer-reviewed literature show that 97% or more (with recent analyses reaching over 99.9%) of climate scientists and climate-related papers agree that humans are causing global warming.”
statistic, article, points to yes. Claim: 97% or more of climate scientists and climate papers agree humans are causing global warming.
3royalsociety.orgAcademic
https://royalsociety.org/news-resources/projects/climate-change-evidence-causes/
Backs: “National Academies of Sciences, the Royal Society, and academies of science from dozens of countries endorse this position.”
evidence, article, points to yes. Claim: Major scientific organizations endorse human-caused warming; temperature rise, atmospheric temperature profile, natural factors can't explain warming, and risks of further warming.
4ipcc.chGovernment
https://report.ipcc.ch/ar6syr/headline.html
Backs: “The IPCC’s Sixth Assessment Report (AR6) states that human activities have unequivocally caused global warming, with global surface temperature reaching about 1.1°C above 1850–1900 levels in 2011–2020.”
statistic, official document, points to yes. Claim: IPCC AR6 says human activities unequivocally caused warming, about 1.1°C above 1850–1900 levels in 2011–2020.
5nasa.govGovernment
https://science.nasa.gov/climate-change/causes/
Backs: “Human emissions have sharply increased atmospheric CO₂ (and methane, nitrous oxide, etc.) since the Industrial Revolution, enhancing this effect.”
evidence, article, points to yes. Claim: Greenhouse effect physics explains warming; human emissions have sharply increased atmospheric CO2 and other gases since the Industrial Revolution.