11. Climate researchers in Greenland can use ice core samples to tell them about carbon dioxide ir the atmosphere in the past. The researchers have found an ice core sample that shows there wa
a period when carbon dioxide in the atmosphere decreased. What happened to the amount of
energy absorbed by Earth's surface during this time?
During this time, the amount of energy absorbed by Earth's surface
a
decreased.
b
increased
С
stayed at a constant level.
d
changed unpredictably.