This graph depicts the average output of carbon dioxide in metric tonnes for each individual in four European countries over an interval of 40 years.
Overall, CO2 emissions per individual in the UK and Sweden began the highest but witnessed a decline toward the end of the period. Conversely, Italy and Portugal started with relatively low emissions but saw considerable increased by the end of the timeframe.
From 1967 to 1977, CO2 output per individual in Sweden had increased from 8.8 tonnes to 10.8 tonnes and then saw a sharp decline by 1987. After that, their emissions continued to decrease gradually around 5.7 which was similar rates like Portugal.
The nation who had the highest rate of CO2 emissions is in the United Kingdom, from 10.8 to 8.9 tonnes, during the period between 1967 and 2007. In contrast, Portugal is the lowest countries among these 4 countries to the output of carbon dioxide from by 1.3 in 1967 to by 5.7 in 2007.
Italy had gradually increased in 1967-2007 and the rate of emissions took the second-highest within 4 European countries in 2007.