Only 10 countries are responsible for about two thirds of the global carbon dioxide emissions. USA and China produce almost one fifth of global carbon dioxide emissions each. The number of inhabitants multiplied with per capita carbon dioxide emissions give the total emissions of a country. E.g. an US-American emits twice the carbon dioxide than a German and 15 times more than an Indian.

The global carbon dioxide emissions and the carbon dioxide concentration in the atmosphere increase continuously. The global emissions from fuel combustion have doubled since the end of the 1960s and increased 10 times since beginning of the last century. If this trend continues extreme climate changes are unavoidable.