What are the major causes of global warming?

Explanation

### Step-by-Step Solution:

1. **Understanding Greenhouse Gases**:
- The primary cause of global warming is the increase in greenhouse gases in the atmosphere. These gases trap heat from the sun, preventing it from escaping back into space. The most common greenhouse gases include carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O).

2. **Land Use Changes**:
- Changes in how land is used also contribute to global warming. This includes activities such as deforestation, urbanization, and changes in agricultural practices. For example, when forests are cut down for agriculture or development, the carbon stored in trees is released into the atmosphere, increasing greenhouse gas concentrations.

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