I completed some questions, the answers which I have italicized. The bolded ques

Question

I completed some questions, the answers which I have italicized. The bolded questions are what I need help with.

CO2 emissions in 1850: 280 ppm = .028%

CO2 is increasing in the atmosphere at the rate of about 2 ppm/year due to human interaction. In 2013 AD, CO2 in the atmosphere is 393 ppm.

(1) What will be the CO2 in 2100?

(2) What is potentially wrong with the answer you calculated above, our prediction for the future based on current CO2 emissions?

(3) What is the percent of CO2 in the atmosphere that humans are emitting per year relative to preanthropogenic levels? (divide the rate of increase by the amount in 1850 and multiply by 100)

= 2/280 x 100 = .714 %

(4) There were 600 gigatons (106 tons) of carbon in the atmosphere in 1850. How many gigatons accumulated in the atmosphere each year due to human activity? (% we are emitting each year x 600)

= .714 % x 600 = 4.286 gigatons

Humans are emitting 7.7 gigatons (Gt) of fossil fuel each year and 1.3 Gt from land use changes. (5) Why is the answer only about ½ of the total of 9 Gt?

Explanation / Answer

1) Number of years since 1850 = 2100-1850 = 250
   The concentration of the CO2 in 2100 = 280 + 250 * 2
                                          = 780 ppm

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