The bar chart compares the carbon emissions produced by three fossil fuels over two decades. Overall, the only one that has faced a surge is gas, while the other two pummeted. The coal turned from being the major cause of emission to the less relevant among the three fuels.
Gas is the only that rose consistently over the years. In 1990, it ranked as the fuel with the smallest impact, with slightly more than 200 million tons produced. Over the years, we can observe an upward trend which, in 2010, made gas be the main contributor to emissions, with more than 300 million tons.
Conversely, oil and coal underwent a decline throughout the whole period. In 1990, coal was responsible for more than 300 million tons of carbon emission, and oil caused more than 250 million tons. From then on, coal steadily decreased, reaching the bottom at less than 200 million tons, whereas oil moderately fluctuated, leaning towards 210 million tons which it attained in 2010.
