The line graph delineates the acid rain emissions in the United Kingdom, quantified in millions of tonnes, across four distinct sectors from 1990 to 2007.
Overall, there was a marked decline in total acid rain emissions across all sectors over the period, with the most substantial reduction observed in the electricity, gas, and water supply sector, while the transport and communication sector exhibited a relatively modest decrease.
The electricity, gas, and water supply sector consistently recorded the highest emission levels throughout the period, starting at 3.1 million tonnes in 1990. This figure experienced a sharp decline to 2.3 million tonnes by 1993, followed by a more gradual reduction, culminating at approximately 1.6 million tonnes in 2007. In contrast, emissions from other industries commenced at 1 million tonnes in 1990, peaked marginally at 1.1 million tonnes in 1991, and then steadily diminished to just above 0.5 million tonnes by the end of the period.
The transport and communication sector began at around 0.7 million tonnes in 1990, reaching a minor peak of approximately 0.75 million tonnes in 1992 before declining to nearly 0.5 million tonnes in 2007. The domestic sector, starting at 0.7 million tonnes, exhibited slight fluctuations within the 0.6-0.9 million tonnes range, eventually settling at about 0.65 million tonnes in 2007. Notably, both the transport and domestic sectors showed only minor overall changes compared to the more pronounced reductions in the industrial sectors.