What is global sink of `CO_2` ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Terms**:
- First, we need to clarify the terms "sink" and "reservoir." A reservoir is a space where a substance is collected and can be extracted, while a sink is a place where a substance is dumped or absorbed.

2. **Identifying the Global Sink for CO2**:
- The global sink for carbon dioxide (CO2) refers to the primary area where CO2 is absorbed from the atmosphere.

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