The line graph compares the average amount of carbon dioxide released by a person in four different countries over a four-decade period starting from 1967 to 2007.

The line chart illustrates the amount of CO2 emissions each capita in 4 countries over the course of 40 years, starting in 1977. Overall, the most noticeable feature is a sginificant upward trend in CO emission in Italy and Spain, a substantial drop in the UK and Sweden. Furthermore, the UK registers the highest figure in the proportion of emission during the period shown. In 1977, the Spanish released just above 1 ton CO, compared to 4 tons in Italy. These figure subsequently experienced a considerable increase to just below 8 and 6 tons per person respectively before remaining relatively unchanged in the 10 consecutive years. Average amount of CO emission in Sweden stood at approximately 8 tons every capita in 1977 and reached its peak of roughly 10 tons in 1987, prior to a rapid slump to nearly 5 tons each individual in 2017. Moreover, the UK residents released slightly more than Sweden counterpart in 1077 ( above 10 tons) and stayed a steady level before having a gradual decline in 30 following years.