The bar chart illustrates how much CO2 in tonnes produced three income groups in 1990 and 2000, while the pie chart demonstrates the percentage of people divided into three income groups in 2000.
Overall, the largest amount of cardon dioxide released by middle income group in both years, while the lowest amount of CO2 released by low income group. By contrast, the biggest proportion of population is high income people.
In 1990, 13 metric tonnes were recorded for high salary people, whereas only 1 tonne of CO2 was released by low income group. Meanwhile, the figure for middle income group produced 15 metric tonnes of carbon dioxide. Over the decade, the amount of tonnes released by high income group declined by 1 tonne. In contrast, low income group increased the amount of CO2 to 2 tonnes, while the amount of CO2 emitted by middle income group jumed to 22 metric tonnes.
Although middle income group released the biggest volume of cardon dioxide, this group made up only 34% the total world population, in 2000. However, high income group that released only 12 metric tonnes, in 2000, accounted for 84% of the total. Meanwhile, 18% of the population represented low income group.
