We can assume that the levels of carbon dioxide in 1959 are the 100% of all the emissions. Then, if in 2005 the figure was 395 parts per million, we have that the increase is:
[tex]\begin{gathered} \frac{395\cdot100}{339}=\frac{39500}{339}=116.52 \\ \Rightarrow116.52-100=16.52 \end{gathered}[/tex]therefore, the percent increase was of 16.52%
Next, we have the following:
[tex]339(16.52\%)=339(0.1652)=56[/tex]thus, the increase in carbon dioxide levels is 56 parts per million
