Given
The graph is given where x -axis denotes year and y-axis denotes carbon-dioxide in ppm.
Explanation
To determine the rate that co2 increases per year .
[tex]R=\frac{\Delta CO_2}{\Delta t}[/tex]
Substitute the values from the graph.
[tex](1980,340),(2000,380)[/tex]
[tex]\begin{gathered} R=\frac{380-340}{2000-1980} \\ R=\frac{40}{20} \\ R=2 \end{gathered}[/tex]Answer
Hence the rate that co2 increases per year is 2.
