The main "countries-only" figure, with power-per-area contours "no vectors" eps Hi Res png Suggested caption: Power consumption per person versus population density, in 2005. Point size is proportional to land area (except for areas less than 38 000 km2 (e.g. Belgium), which are shown by a fixed smallest point size to ensure visibility). Both axes are logarithmic. The straight lines with slope -1 are contours of equal power consumption per unit area. Seventy-eight per cent of the world's population live in countries that have a power consumption per unit area greater than 0.1 W/m2. (Average powers per unit area are sometimes measured in other units, for example kWh per year per square metre; for the reader who prefers those units, the following equivalence may be useful: 1 W = 8.766 kWh per year.)

The same "countries-only" figure, with vectors showing 15 years of "progress" for Australia, Libya, the United States, Sudan, Brazil, Portugal, China, India, Bangladesh, the United Kingdom, and S. Korea. Also includes little arrows to indicate a few small countries that fall off the edge of the diagram. eps Hi Res png Suggested caption: Power consumption per person versus population density, in 2005. Point size is proportional to land area. Line segments show 15 years of `progress' (from 1990 to 2005) for Australia, Libya, the USA, Sudan, Brazil, Portugal, China, India, Bangladesh, the UK and the Republic of Korea. Seventy-eight per cent of the world's population live in countries that have a power consumption per unit area greater than 0.1 W/m2.