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Author Question: As of 2015, what is the approximate CO2 level in Earths atmosphere? a. 100 ppm b. 200 ppm c. ... (Read 9 times)

mckennatimberlake

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on: Jul 13, 2018
As of 2015, what is the approximate CO2 level in Earths atmosphere?
   a. 100 ppm
   b. 200 ppm
   c. 400 ppm
   d. 800 ppm
   e. 1200 ppm

Question 2

Approximately when did the rapid increase in human-produced atmospheric CO2 begin?
   a. 1900
   b. 1930
   c. 1950
   d. 1980
   e. 2000


randomguy133

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Reply #1 on: Jul 13, 2018
Answer to Question 1

ANSWER: c

Answer to Question 2

ANSWER: c


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