What are the main disadvantages of deforestation?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Deforestation**:
Deforestation refers to the large-scale removal of trees from forests by humans, primarily to facilitate human activities such as agriculture, urban development, and logging.

2. **Disadvantage 1: Increased Carbon Dioxide Levels**:
- Trees play a crucial role in the environment by absorbing carbon dioxide (CO2) during the process of photosynthesis and releasing oxygen (O2).
- When trees are removed, there are fewer plants to absorb CO2, leading to an increase in its concentration in the atmosphere. This can contribute to global warming and climate change.
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