Is climate change real?

Yes, climate change is real. The overwhelming scientific evidence shows that Earth’s climate is warming rapidly, primarily due to human activities, and this conclusion is supported by multiple independent lines of evidence and near-universal consensus among climate scientists.[1]

Scientific Consensus

•The Intergovernmental Panel on Climate Change (IPCC), which assesses peer-reviewed literature from thousands of scientists worldwide, states it is unequivocal that human influence has warmed the atmosphere, ocean, and land. Global surface temperature reached approximately 1.1°C above 1850–1900 levels in 2011–2020.[2]

•Surveys of the scientific literature find that more than 99.9% of peer-reviewed climate papers agree that climate change is mainly human-caused (updating earlier findings of ~97%). Major scientific organizations (NASA, NOAA, national academies of science, American Meteorological Society, AAAS, and others) endorse this view.[3]

Key Evidence That the Planet Is Warming

Multiple independent measurements confirm warming:

•Global temperatures: Instrumental records from weather stations, ships, buoys, and satellites show Earth’s average surface temperature has risen about 1–1.1°C (roughly 1.8–2°F) since the late 19th century, with most warming in recent decades. Recent years (including 2023 and 2024) have been among the hottest on record. Different teams (NASA, NOAA, UK Met Office, Berkeley Earth) produce consistent results.[4]

•Oceans: The oceans have absorbed most of the excess heat (~91%), leading to higher ocean heat content, warming sea surface temperatures, and marine heatwaves.

•Cryosphere (ice): Mountain glaciers are retreating worldwide; Greenland and Antarctic ice sheets are losing mass (hundreds of billions of tons per year); Arctic sea ice extent has declined sharply (nearly 40% at summer minimum since 1979); Northern Hemisphere snow cover is decreasing.[5]

•Sea level: Global mean sea level has risen 8–9 inches (about 21–24 cm) since 1880, with the rate accelerating.

•Other indicators: Shifts in plant and animal ranges/phenology (earlier springs, species moving poleward), increased frequency/intensity of heat extremes, and changes in precipitation patterns.

Paleoclimate records (ice cores, tree rings, sediments, corals) show that the current rate of warming is unusually rapid compared to natural changes over thousands of years. Atmospheric CO₂ levels are higher than at any point in at least the last 800,000 years.[4]

Humans Are the Primary Cause

•The main driver is the increase in greenhouse gases (especially CO₂, methane, and nitrous oxide) from burning fossil fuels (coal, oil, gas), deforestation, and other activities. These trap heat in the atmosphere (the enhanced greenhouse effect), a principle established by physics for over a century.

•Isotopic analysis of atmospheric CO₂ confirms the extra carbon comes from fossil fuels.

•Natural factors (solar variability, volcanoes, orbital cycles, internal variability like El Niño) cannot explain the observed warming pattern or magnitude. For example, the upper atmosphere (stratosphere) is cooling while the lower atmosphere warms—a fingerprint of greenhouse gas forcing, not increased solar output. Climate models that include only natural forcings fail to reproduce the recent warming; those including human emissions match observations.[6]

•IPCC assessments attribute the bulk of observed warming since the mid-20th century (best estimate ~1.07°C human-caused) to humans, with natural drivers contributing negligibly.[2]

Earth’s climate has always varied naturally over geological time (ice ages, etc.), but the current changes are distinguished by their speed, the clear human fingerprint from greenhouse gases, and the fact that they are occurring against a backdrop of relatively stable Holocene climate that allowed human civilization to develop.

While details of future regional impacts, exact sensitivity, and tipping elements involve ongoing research and some uncertainty ranges, the core facts—that the climate is warming and humans are the dominant cause—are established with very high confidence. Observations continue to align with and strengthen these conclusions. For primary sources, see IPCC AR6 reports, NASA’s Climate Change evidence page, and NOAA Climate.gov.

Citations (6)

1ipcc.chGovernment
https://www.ipcc.ch/report/ar6/syr/resources/spm-headline-statements/
Backs: “The overwhelming scientific evidence shows that Earth’s climate is warming rapidly, primarily due to human activities, and this conclusion is supported by multiple independent lines of evidence and near-universal consensus among climate scientists.”
2ipcc.chGovernment
https://www.ipcc.ch/report/ar6/wg1/chapter/summary-for-policymakers/
Backs: “Global surface temperature reached approximately 1.1°C above 1850–1900 levels in 2011–2020.”
3eurekalert.orgAcademic
https://www.eurekalert.org/news-releases/931811
Backs: “Major scientific organizations (NASA, NOAA, national academies of science, American Meteorological Society, AAAS, and others) endorse this view.”
4nasa.govGovernment
https://science.nasa.gov/climate-change/evidence/
Backs: “Different teams (NASA, NOAA, UK Met Office, Berkeley Earth) produce consistent results.”
5climate.govGovernment
https://www.climate.gov/news-features/climate-qa/what-evidence-exists-earth-warming-and-humans-are-main-cause
Backs: “Arctic sea ice extent has declined sharply (nearly 40% at summer minimum since 1979); Northern Hemisphere snow cover is decreasing.”
6theenergycollective.comNot yet classified
https://theenergycollective.com/climate-change-evidence/
Backs: “Climate models that include only natural forcings fail to reproduce the recent warming; those including human emissions match observations.”