The line graph illustrates the average CO2 emissions produced per capita in four countries; namely Britain, Portugal, Italy and Sweden between 1967 and 2007. Overall, the UK was the highest in terms of CO2 emissions, whilst Portugal was the lowest during the same period. According to the figure, United Kingdom and Sweden were the two nations with the most of the C02 production in 1967.However, in a 40-year time span, it has decreased for alike. Concerning the former, Co2 emissions was slightly in decline till 1977 before a gradual decline till 2007. The latter observed a significant climb passing from around 8.5 to just over 10 in 1977. From this date, CO2 emissions have declined drastically till 2007 moving to less than 6 metric tons. On the other hand, pollution jumped in Italy and Portugal. A rocketed surge in CO2 emissions can be noticed from 1967 to 1977 for Italy before a gradual growth. The Portugal’s CO2 emissions moved upward abruptly till 1997 before a steady grow until 2007. To conclude, despite the awareness of environment issues, UK is still the most CO2 producer in 2007, amid the four-country analyzed. Portugal is still the less polluter state though.