The graph show ["", "", "", "", ""] correlation. When the world population increases, we would expect the Atmospheric Carbon Dioxide levels to ["", "", ""] . When the carbon dioxide levels were at 390...

The graph show       ["", "", "", "", ""]  correlation.  When the world population increases, we would expect the Atmospheric Carbon Dioxide levels to       ["", "", ""]  .   When the carbon dioxide levels were at 390 parts per million (ppm), the world population was about       ["", "", ""]  millions.

Extracted text: CO, Level v. Population for 1960 - 2015 420 400 2015 380 360 340 320 1960 300 3000 4000 5000 6000 7000 8000 World Population (millions) Atmospheric CO, Level (ppm)