Which of the following pools contain the largest amount of the world's carbon?
A) soil B) atmosphere C) animals D) vegetation
Question 2
Which of the following is a (are) major source(s) of the carbon dioxide now being added to the atmosphere in excess of the amount taken out by plants?
A) destruction of natural forests
B) loss of soil organic matter
C) burning of fossil fuels
D) all of the above
E) none of the above
