Evidence

Evidence of global warming:

Graph of average Global Temperatures with trend line: 1880 - 2015 (NOAA) — Air temperatures increasing

graph of carbon dioxide levels in the atmosphere over 600,000 years — Carbon dioxide levels soaring

Graph: Temperature and CO2 Levels over 800,000 years - v2 — Air temperatures and carbon dioxide levels have moved together for over 800,000 years

Graph: The Average September Area of Arctic Ice: 1979 - 2013 — Arctic ice decreasing

Graph: Antarctica Ice Decline: 2002 - 2013 — Antarctic ice decreasing

Graph: Greenland Ice Decline: 2002 - 2013 — Greenland ice decreasing

The graph of sea levels from 1993 to 2014 shows a clear upward trend. — Sea levels rising

NASA says “Sea level is THE yardstick of global warming”. The rising sea level shows that our planet is warming.

graph of atmospheric methane over 800,000 years — Methane levels soaring

Average Global Sea Surface Temperature: 1880 - 2015 — Ocean surface warming

A map showing where the Great Barrier Reef bleached in 2016 and 2017 — Mass coral bleaching increasing

Graph: CO2 and Sea-water pH Levels: 1958 - 2009 — Ocean acidity increasing

All This Evidence Fits Together

Image of convergence: A red arrow and five blue arrows meet point to point

Notice how all this evidence fits together and is consistent with humans causing global heating. For example, it makes sense that both “global temperatures are increasing” and “Arctic ice is decreasing”. It is the convergence of evidence like this that leads to scientific confidence.

Evidence of human causation

Independent research suggesting humans are causing climate change

Up-to-date information and graphs of many of the above factors are available on:

Climate Dot US

The Trump administration laid off many scientists who ran the government’s climate websites, then modified or shut the sites. So, the scientists have built this website, with their own resources.

Loaded May 2014, Modified 26 July 2026.