Box 16.1 in your textbook discusses why an atmospheric concentration of carbon d

Question

Box 16.1 in your textbook discusses why an atmospheric concentration of carbon dioxide at 350 ppm may be ideal for ensuring a stable climate for future generations. Based on your estimate from Question 1: What is the expected atmospheric concentration of carbon dioxide (ppm) in 2050 if we follow "business-as-usual" fossil fuel consumption? How much carbon (in gigatonnes) will need to be removed from the atmosphere to reach a concentration of 350 ppm after 2050? 1 ppm atmospheric carbon dioxide = 2.12 gigatonnes of carbon in the atmosphere. Please type your answers out in the following format: Atmospheric concentration of carbon dioxide in 2050 = XXX ppm Amount of carbon to be removed after 2050 to return to 350 ppm atmospheric carbon dioxide = YYY gigatonnes of carbon

Explanation / Answer

present levels of CO2= 400ppm (assumed)

CO2 to be reduced to 350ppm, So the reduction in CO2= 400-350= 50 ppm

1ppm= 2.12 gigatones of Carbon

50ppm of CO2 correspond to 50*2.12 gigatones of Carbon =106 gigatonnes of Carbon

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