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Author Question: What is the main source of the increased levels of carbon dioxide in the atmosphere? a. Methane ... (Read 159 times)

sam.t96

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on: Jun 19, 2018
What is the main source of the increased levels of carbon dioxide in the atmosphere?
 
  a. Methane c. Landfills b. Deforestation d. Burning fossil fuels

Question 2

What is the percentage by which CO2 concentration has increased since 1750?
 
  a. 21 c. 41 b. 31 d. 51
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Zack0mack0101@yahoo.com

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Reply #1 on: Jun 19, 2018
Answer to Question 1

ANS: D
The main source of the increased levels of carbon dioxide in the atmosphere is the burning of fossil fuels, causing 75 of the increase.



Answer to Question 2

ANS: B
According to the IPCC carbon dioxide concentration has increased by 31 since 1750.



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