Consider the below figure showing carbon dioxide level changes with time. 
What is the reason for the rise in CO2 levels?
Definitions:
New Memories
The process of creating and storing new information or experiences in the brain.
Hippocampus
A region of the brain associated with memory and spatial navigation.
Long-Term Storage
The phase of memory in which information is retained for prolonged periods of time, potentially indefinitely.
Hippocampus
A part of the brain involved in memory formation, navigation, and emotional regulation.
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