The bar chart illustrates three types of emission sources-gas, oil, and coal-over the period from 1990 to 2010, measured in tons. Overall, while the gas emission increased consistently by the end, the reverse was true for oil and coal emission.
In 1990, the gas emission started at approximately 220 tons, a number that reached a peak up-to about 320 tons in 2010 with a steady growth between 1995 and 2005. By contrast, the amount of oil emission was higher, beginning at 270 tons in 1990. The following pattern dropped to 240 tons in 1995, before recovering slightly in 2000. In the final year, it markedly decreased to 210 tons.
Coal emissions were the highest level of emission, starting at just above 300 tons in the first year. Figure for coal emission declined to 280 tons in 1995, following year it fell up-to 250 tons. The figure declined markedly to 190 tons by the end.