Computer-generated map of the world showing the distribution of carbon dioxide released from the combustion of fossil fuels. The map was created using country statistics of natural gas, crude oil & coal consumption for 1987. Estimates of carbon dioxide emissions were then distributed geograph- ically based on the human population (this assumes that energy is distributed on a per capita basis). The scale is measured in kilogrammes of carbon per square metre per year. Black areas indicate an absence of data. Levels of carbon dioxide, the most abundant & important of the greenhouse gases, are generally taken as an index of global warming.

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