EVIDENCE 01
Global temperature is rising
Average surface temperature anomaly compared to the 1951–1980 baseline. The Earth has warmed roughly 1.2°C since 1900, with most of that warming happening since 1980. Source: NASA GISS.
The Data
Evidence of global warming
The evidence is everywhere — in the air, in the oceans, in the ice. Here are five independent measurements from agencies like NASA and NOAA that all tell the same story.
EVIDENCE 02
Sea levels are climbing
Satellite altimetry shows global mean sea level has risen over 100 mm since 1993 — driven by melting glaciers and the thermal expansion of warming oceans. Source: NASA Sea Level Change.
EVIDENCE 03
Arctic sea ice is shrinking
The minimum extent of Arctic sea ice each September has dropped sharply. We've lost roughly half of the late-summer ice that existed in 1980. Source: NSIDC.
| Year | Min. Extent (million km²) | vs. 1980 |
|---|---|---|
| 1980 | 7.8 | — |
| 1990 | 6.6 | -15% |
| 2000 | 6.3 | -19% |
| 2007 | 4.3 | -45% |
| 2012 | 3.4 | -56% |
| 2020 | 3.9 | -50% |
| 2023 | 4.2 | -46% |
EVIDENCE 04
CO₂ in the atmosphere
Atmospheric carbon dioxide measured at Mauna Loa has climbed from 317 ppm in 1960 to over 420 ppm today — higher than at any point in the last 3 million years. Source: NOAA Keeling Curve.
EVIDENCE 05
Wildfires & heatwaves worldwide
Climate change is fueling more frequent and intense wildfires and heatwaves. The hotspots below mark major recent events on every inhabited continent. Source: IPCC AR6, 2023.
CaliforniaAmazonMediterraneanCentral AfricaSiberiaAustralia