Using the information provided for the past 800,000 years:
a. estimate the length of time that it took for CO2 to go from 200 to 300 ppm.
b. estimate the length of time that it took for CO2 to go from 300 to 400 ppm.
c. Compare the rate of change from 300 ppm to 400 ppm to the rate of change from 200 to 300 ppm.

Using the information provided for the past 800000 years a estimate the length of time that it took for CO2 to go from 200 to 300 ppm b estimate the length of t class=