Picture credits
The diagrams and charts are our own. The photos and portraits are public domain or CC0 on Wikimedia Commons, cropped and resized with no other changes.
Photos and portraits
Pl23 corp2701 - NOAA Photo Library - Keeling Flask at Mauna Loa Observatory.jpg
by Commander John Bortniak, NOAA, Public domain
Antarctic Ice Shelf Loss Comes From Underneath (9036164848).jpg
by NASA Goddard Space Flight Center, Public domain
Charles David Keeling and John Chin at Mauna Loa Observatory in 1997.jpg
by John Miller (NOAA), Public domain
Arctic Sea Ice Minimum 2023 (SVS5162 - sea ice min 2023).png
by NASA Scientific Visualization Studio, Public domain
Our own diagrams and charts
Line chart of yearly average carbon dioxide at Mauna Loa, rising from 315.98 parts per million in 1959 to 427.35 in 2025, with a slight upward curve
Our own drawing
Simplified drawing of the greenhouse effect: yellow arrows of sunlight reach the ground, red arrows of infrared heat rise from it, and a layer of greenhouse gases sends some of the heat back down while some escapes to space
Our own drawing
Bar drawing comparing carbon dioxide levels: no higher than 300 parts per million in ice-age cycles of the past million years, about 280 before the Industrial Revolution, and 422.8 as the global average in 2024
Our own drawing
Simplified drawing of the two main reasons sea level rises: meltwater from glaciers and ice sheets on land flowing into the sea, and seawater expanding as it warms
Our own drawing
Bar chart of yearly global surface temperature from 1880 to 2025 compared with the 1951 to 1980 average: mostly blue bars below the line before about 1940, then red bars that grow taller, highest in 2024
Our own drawing
The diagrams are simplified teaching drawings, not to scale. The two charts are drawn by our own code from NOAA and NASA data files. The Data Explorer and the games are our own code. Useless the eraser is the network’s own mascot. Fonts: Bricolage Grotesque, Newsreader and Kalam (SIL Open Font Licence), served from this site.