Is climate change real?

Yes, climate change is real. The Earth is warming at an unprecedented rate in recent millennia, primarily due to human activities, and this is supported by overwhelming scientific evidence and near-unanimous consensus among climate experts.[1]

Scientific Consensus

Multiple independent studies of peer-reviewed literature and surveys of climate scientists show extremely high agreement:

•Around 97% of climate scientists agree that human-caused climate change is happening, with more recent analyses finding greater than 99% consensus in the scientific literature (e.g., surveys of tens of thousands of papers).[2]

•Leading scientific organizations worldwide—including NASA, NOAA, the Intergovernmental Panel on Climate Change (IPCC), the American Association for the Advancement of Science (AAAS), the National Academies of Sciences, the American Geophysical Union, and many others—have issued statements affirming that the climate is changing and that human greenhouse gas emissions are the primary driver.[1]

•The IPCC’s Sixth Assessment Report (AR6) states it is “unequivocal” that human influence has warmed the atmosphere, ocean, and land, with global surface temperature reaching about 1.1°C above 1850–1900 levels in 2011–2020.[3]

There is no significant scientific debate on the core facts among actively publishing climate experts; dissenting views are rare and typically not supported by the broader body of evidence.

Key Evidence That the Planet Is Warming

Observations from multiple independent lines of evidence confirm rapid warming:

•Global temperatures: Earth’s average surface temperature has risen by roughly 1°C (about 1.8°F) since the late 19th century/1880, with most warming in recent decades. The past decade includes the warmest years on record. Multiple datasets (NASA GISTEMP, NOAA, Hadley Centre, etc.) agree.[4]

•Oceans: The ocean has absorbed most of the excess heat (around 90%), with the top layers warming significantly. Sea levels have risen about 8–9 inches (20+ cm) since 1880, with the rate accelerating.[5]

•Cryosphere (ice and snow): Greenland and Antarctic ice sheets are losing mass (hundreds of billions of tons per year), glaciers are retreating nearly worldwide, Arctic sea ice extent and thickness have declined sharply, and Northern Hemisphere spring snow cover is decreasing.[5]

•Other indicators: Earlier plant blooming and animal migrations, shifts in species ranges, more frequent/intense heatwaves and heavy precipitation in many regions, and ocean acidification (surface ocean acidity up ~30% since the Industrial Revolution due to absorbed CO₂).[5]

Paleoclimate records (ice cores, tree rings, sediments, corals) show that the current rate of warming is much faster—roughly 10 times faster—than typical post-ice-age recoveries, and CO₂ is rising ~250 times faster than natural rates after the last ice age.[5]

Human Cause

The primary driver is the increase in atmospheric greenhouse gases (especially CO₂, methane, and nitrous oxide) from burning fossil fuels, deforestation, and other activities since the Industrial Revolution. Atmospheric CO₂ has risen from ~280 ppm pre-industrially to over 420 ppm today. The isotopic fingerprint of the added carbon matches fossil fuels, not natural sources.[4]

Natural factors (solar variability, volcanoes, orbital cycles) cannot explain the observed warming pattern: the lower atmosphere/troposphere is warming while the upper atmosphere/stratosphere cools (consistent with greenhouse forcing, not solar), and no other known forcings match the magnitude or fingerprint of the changes.[6]

Climate has always varied naturally, but the current changes are distinct in speed, cause, and global coherence. Continued emissions will drive further warming, with risks escalating with every additional fraction of a degree.[3]

In short, the evidence from direct measurements, satellites, paleoclimate proxies, physical understanding of the greenhouse effect (established since the 19th century), and comprehensive assessments is robust and multi-faceted. For primary sources, see NASA’s climate pages, NOAA Climate.gov, and IPCC reports.

Citations (6)

1nasa.govGovernment
https://science.nasa.gov/climate-change/scientific-consensus/
Backs: “The Earth is warming at an unprecedented rate in recent millennia, primarily due to human activities, and this is supported by overwhelming scientific evidence and near-unanimous consensus among climate experts.”
2sciencedaily.comNews and mediaquality 0.85
https://sciencedaily.com/releases/2021/10/211019082702.htm
Backs: “Around 97% of climate scientists agree that human-caused climate change is happening, with more recent analyses finding greater than 99% consensus in the scientific literature (e.g., surveys of tens of thousands of papers).”
3ipcc.chGovernment
https://report.ipcc.ch/ar6syr/headline.html
Backs: “The IPCC’s Sixth Assessment Report (AR6) states it is “unequivocal” that human influence has warmed the atmosphere, ocean, and land, with global surface temperature reaching about 1.1°C above 1850–1900 levels in 2011–2020.”
4archive.mdData and tools
https://archive.md/2024.11.07-200429/https://www.climate.gov/news-features/climate-qa/what-evidence-exists-earth-warming-and-humans-are-main-cause
Backs: “Multiple datasets (NASA GISTEMP, NOAA, Hadley Centre, etc.) agree.”
5nasa.govGovernment
https://science.nasa.gov/climate-change/evidence/
Backs: “Sea levels have risen about 8–9 inches (20+ cm) since 1880, with the rate accelerating.”
6archive.vnData and tools
https://archive.vn/2025.11.30-145549/https://science.nasa.gov/climate-change/causes/
Backs: “Natural factors (solar variability, volcanoes, orbital cycles) cannot explain the observed warming pattern: the lower atmosphere/troposphere is warming while the upper atmosphere/stratosphere cools (consistent with greenhouse forcing, not solar), and no other known forcings match the magnitude or fingerprint of the…”