Band 4+: A graph is shown below. It represents the average CO2 emissions per person among four European countries; Italy, Sweden, Portugal, and the United Kingdom over four decades, from 1967 to 2007.

The provided line graph illustrates the emission of carbon dioxide in metric tons in the United Kingdom, Sweden, Italy, and Portugal in the period of a decade since 1976.

Overall, the emission of carbon dioxide in Italy and Portugal had skyrocketed gradually. Whereas the production of carbon dioxide has been in rapid decline in two countries, the United Kingdom and Sweden, in the past decade.

Over ten metric tons of carbon dioxide were produced in 1976 in the United Kingdom; it is the heaviest producer compared to others. The trend line is a gradual decline in consecutive years. In Sweden, carbon dioxide production went up in a year from 976 to 1977 and fell sharply until 1987. Beyond that year, a slight reduction in the emission of CO2.

In the context of a country like Portugal, it has the lowest production of CO2 compared to other countries. The trend line of carbon release in Portugal had been rising gradually up until 2007. Italy is the fastest-growing country in Europe. The carbon emission trend line had a significant increase during a decade in Europe.