Question

1. In 1910, the average level of CO, in the atmosphere was 300ppm. In 2005, it was380ppm. What is the percent change in atmospheric CO2?Answer:

Answer 1

We need to first find out the overall change in the CO concentration.

We'll have it to be: change = Current - Former = 380 - 300 = 80ppm

Percent change =

$\begin{gathered} \frac{change}{\text{former}}\times100 \\ \frac{80}{300}\times100=26.67\text{ percent} \end{gathered}$

Therefore, percent change = 26.67%