Following up on other global mapping posts (population cartogram (distorted) & pop vs. economy cartograms), here is a cartogram from Jerrad Pierce showing countries sized by their ecological footprint and coloured according the their status as a net surplus or debtor nation.
One the website, the map is explained:
This thematic map shows two variables; 1) coloration indicates reserve(green) – deficit(red) of national biocapacity and 2) area indicates absolute consumption of biocapacity.
Consumption = Appropriated National Biocapacity + Imports - Exports
The area of each country has been distorted to represent its consumption i.e.; its ecological footprint. Countries which appear larger than normal are consuming more than their fair share and smaller countries are consuming less.
1) Features with missing data are shown in blue, and are scaled as if they were in ecological balance.
2) Fair share of a country is considered to be equal to the global biocapacity per capita, currently 2.1 global ha/person. Note that this does not take into account land dedicated for reserves for biodiversity.
There is also a dynamic web GIS on the site that, although buggy, allows you to play around with a few types of cartograms.