Is climate change real?

Yes, climate change is real. It is unequivocally happening, driven primarily by human activities, according to the overwhelming scientific consensus and multiple independent lines of evidence.[1]

Scientific Consensus

Multiple studies of peer-reviewed literature and surveys of climate scientists show near-unanimous agreement:

•About 97% of climate scientists agree that human-caused climate change is occurring (with more recent analyses finding over 99% or even >99.9% consensus in relevant papers).[2]

•Leading scientific organizations worldwide—including NASA, NOAA, the Intergovernmental Panel on Climate Change (IPCC), the U.S. National Academies of Sciences, the American Association for the Advancement of Science (AAAS), the American Meteorological Society, and many others—endorse this position. There is no credible scientific organization with relevant expertise that disagrees on the basics.[1]

•The IPCC states it is “unequivocal that human influence has warmed the atmosphere, ocean and land” since pre-industrial times.[3]

Natural climate variations have occurred throughout Earth’s history, but the current warming is happening much faster and is primarily attributable to human greenhouse gas emissions (especially CO₂ from burning fossil fuels), not natural factors like solar variability or volcanoes alone.[4]

Key Evidence

Multiple independent observations confirm the planet is warming and the climate is changing:

•Global temperatures: Earth’s average surface temperature has risen by roughly 1.1–1.5°C (about 2–2.7°F) since the late 19th/pre-industrial period (1850–1900). The warming rate since 1970 is faster than in any other 50-year period in at least the last 2,000 years. Recent years (including 2023 and 2024) have been among the warmest on record.[5]

•Greenhouse gases: Atmospheric CO₂ has risen from ~280 ppm pre-industrially to over 420 ppm recently (e.g., ~423–425 ppm in 2024), levels unprecedented in at least 800,000 years (and far higher growth rates than natural post-ice-age changes). Methane and nitrous oxide have also increased significantly due to human activity. These gases trap heat.[6]

•Other indicators: Oceans are warming and acidifying; sea levels are rising; Arctic sea ice and glaciers/ice sheets are declining; permafrost is thawing; and there are observed shifts in species ranges, earlier springs, more frequent/intense heatwaves, heavy precipitation, and other extremes—patterns consistent with greenhouse warming and inconsistent with alternative explanations.[7]

These findings come from surface stations, satellites, ocean buoys, ice cores, tree rings, and other paleoclimate records, cross-checked by independent teams (NASA, NOAA, Hadley Centre, etc.). Climate models that include human forcings successfully reproduce the observed warming; those with only natural factors do not.[8]

In short, the evidence is robust, multi-faceted, and has strengthened over decades of research. While details of future projections and regional impacts involve some uncertainty (as with any complex system), the core reality of ongoing, human-driven climate change is established science.

Citations (8)

1nasa.govGovernment
https://science.nasa.gov/climate-change/scientific-consensus/
Backs: “It is unequivocally happening, driven primarily by human activities, according to the overwhelming scientific consensus and multiple independent lines of evidence.”
2cornell.eduAcademic
https://news.cornell.edu/stories/2021/10/more-999-studies-agree-humans-caused-climate-change
Backs: “About 97% of climate scientists agree that human-caused climate change is occurring (with more recent analyses finding over 99% or even >99.9% consensus in relevant papers).”
3climate.govGovernment
https://www.climate.gov/news-features/climate-qa/isnt-there-lot-disagreement-among-climate-scientists-about-global-warming
Backs: “The IPCC states it is “unequivocal that human influence has warmed the atmosphere, ocean and land” since pre-industrial times.”
4c2es.orgNot yet classified
https://www.c2es.org/content/climate-science-qa/
Backs: “Natural climate variations have occurred throughout Earth’s history, but the current warming is happening much faster and is primarily attributable to human greenhouse gas emissions (especially CO₂ from burning fossil fuels), not natural factors like solar variability or volcanoes alone.”
5nasa.govGovernment
https://science.nasa.gov/climate-change/evidence/
Backs: “Recent years (including 2023 and 2024) have been among the warmest on record.”
6climate.govGovernment
https://www.climate.gov/news-features/understanding-climate/climate-change-atmospheric-carbon-dioxide
Backs: “Methane and nitrous oxide have also increased significantly due to human activity. These gases trap heat.”
7archive.vnData and tools
https://archive.vn/2023.12.09-152108/https://www.climate.gov/news-features/climate-qa/what-evidence-exists-earth-warming-and-humans-are-main-cause
Backs: “Arctic sea ice and glaciers/ice sheets are declining; permafrost is thawing; and there are observed shifts in species ranges, earlier springs, more frequent/intense heatwaves, heavy precipitation, and other extremes—patterns consistent with greenhouse warming and inconsistent with alternative explanations.”
8royalsociety.orgAcademic
https://royalsociety.org/news-resources/projects/climate-change-evidence-causes/
Backs: “Climate models that include human forcings successfully reproduce the observed warming; those with only natural factors do not.”