Mention one main cause for greenhouse effect.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Greenhouse Effect**: The greenhouse effect refers to the warming of the Earth's surface due to the trapping of heat by certain gases in the atmosphere. This process is essential for maintaining the Earth's temperature but can become problematic when enhanced by human activities.

2. **Identifying Gases Involved**: The primary gases responsible for the greenhouse effect include carbon dioxide (CO2), methane (CH4), and other greenhouse gases. These gases absorb and emit infrared radiation, leading to warming.

3. **Main Cause of the Greenhouse Effect**: Among the various contributors to the greenhouse effect, the burning of fossil fuels is a significant cause. Fossil fuels like petroleum and coal release large amounts of carbon dioxide and other greenhouse gases when burned.

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