What are the three main greenhouse gases?

Explanation

**Step-by-Step Solution:**

1. **Understanding Greenhouse Gases**: Greenhouse gases are those gases in the Earth's atmosphere that trap heat. They allow sunlight to enter the atmosphere but prevent some of the heat that the sunlight brings from leaving the atmosphere.

2. **Identifying the Main Greenhouse Gases**: The three main greenhouse gases that contribute significantly to the greenhouse effect are:
- **Water Vapor (H2O)**: This is the most abundant greenhouse gas, and it plays a crucial role in the natural greenhouse effect.
- **Carbon Dioxide (CO2)**: This gas is produced by natural processes such as respiration and volcanic eruptions, as well as human activities like burning fossil fuels and deforestation.
- **Methane (CH4)**: Methane is emitted during the production and transport of coal, oil, and natural gas. It is also released by livestock and other agricultural practices, as well as by the decay of organic waste in landfills.
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