Doubts about the greenhouse effect seem to center on the fact that ______.
A.past increase in carbon dioxide volume and global temperatures have often not corresponded
B.it is difficult to locate and identify carbon dioxide in the atmosphere
C.growing produce in greenhouses has been only marginally profitable
D.the earth is steadily cooling down
A.past increase in carbon dioxide volume and global temperatures have often not corresponded
B.it is difficult to locate and identify carbon dioxide in the atmosphere
C.growing produce in greenhouses has been only marginally profitable
D.the earth is steadily cooling down
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