How does deforestation (cutting trees down), affect carbon dioxide levels in the atmosphere?
A. Trees have no effect on carbon dioxide in the air.
B. When they are cut down they no longer absorb carbon dioxide, increasing the levels in the atmosphere.
C. When they are cut down they no longer produce carbon dioxide, decreasing the levels in the atmosphere.
D. When each tree is cut down, they release a large burst of carbon dioxide, increasing the levels in the atmosphere.