The line graph illustrated the average carbon dioxide emissions each citizen in 4 nations from 1960 to 2020 .The data was expressed in metric tons.
Overall , there was an increase in the amount of CO2 emissions in country A and country B , meanwhile a decline was seen in the figures for country B and country D.In addition , country D had the lowest figure throughout the period.
First , the number of CO2 emissions in country B started at nearly 7 metric tons , after that it experienced a slight rise to above 7 metric tons , before decreased to end the period at approximately 5 metric tons.Similar changes can be seen in the figure for country D , which was about 3,5 metric tons in the first year , following this , it fluctuated slightly in 5 years later , then fell midly to 3 metric tons in the end of the period.
In contrast , 6 metric tons were released in country A in 2010 , next , it increased significantly to surpass the figure for country B at 7 metric tons in 2015 , before ending the period at above 8 metric tons.Similarly , but to a lesser extent , the figure for country C was nearly 4 metric tons at the beginning of the period , with a subsequent rise to 5 metric tons in 2018 , but latter it dropped to under 5 metric tons in the last year.