This is an attempt to redraw the cartograms of the wonderful carbonmap.org created by KILN using the equally wonderful cartogram.js: Shawn Allen's JavaScript implementation of an algoritm to construct continuous area cartograms, by James A. Dougenik, Nicholas R. Chrisman and Duane R. Niemeyer, ©1985 by the Association of American Geographers. This example combines TopoJSON-encoded boundaries of the world from Natural Earth with data from the original project . d3.js does most of the heavy lifting; colours are from colorbrewer.