The bar chart illustrates the three types of emission sources of greenhouse gas in the UK.
Overall, the figure for coal decreased over the years, although it was the main contributor to greenhouse gas at the beginning of the period. By contrast, despite becoming the least contributor in the first year, gas recorded the highest growth throughout the period. Furthermore, oil emissions gradually dropped, except for a slight rose in 2000.
In 1990, gas accounted for approximately 220 million tons, which was the lowest among all sources. This figure, however, gradually increased, reaching around 270 million tons in 1995 and 300 million tons in 2000. In comparison, coal produced around 310 million tons of emission in 1990, making it the largest contributor. This number declined over the years, standing at roughly 280 million tons in 1995 and 250 million tons in 2000.
Meanwhile, emissions from oil made up about 270 million tons in 1990, before declining slightly to around 240 million tons in 1995 and recovering to 250 million tons in 2000. In 2005, gas emissions stood at 310 million tons, which was around 20 million tons higher than the figure for coal in 2005. In 2010, there was a wide gap between the figures for both gas and coal, which was above 300 million tons for the former and 200 million tons for the latter. Furthermore, the figure for oil decreased to 240 million tons in 2005 and 200 million tons in 2010.