Worldmapper is a collection of world maps, where territories are re-sized on each map according to the subject of interest.

Here is  the world based on Total Population (2000):

and compare it to a map based on Carbon Emissions (2000):

Alarming, isn't it?  The United States, a country with one of the smaller populations, has the highest carbon emissions among all of the other countries.

Over 366 maps in varying categories such as wealth, housing, disease, and poverty are now available.  Worldmapper is a great reference tool for curious minds.

[via The Presurfer]