Green-house effect is warming due to

Options

A. infra-red rays reaching earth
B. moisture layer in atmosphere
C. increase in temperature due to increase in carbon dioxide concentration of atmosphere
D. ozone layer of atmosphere

Explanation

**Step-by-Step Solution:**

1. **Understanding the Greenhouse Effect**: The greenhouse effect is a natural process that warms the Earth’s surface. When the sun's energy reaches the Earth, some of it is reflected back to space and the rest is absorbed, warming the planet.

2. **Role of Greenhouse Gases**: Certain gases in the atmosphere, known as greenhouse gases (GHGs), trap heat. The primary greenhouse gas responsible for the greenhouse effect is carbon dioxide (CO2), but other gases like methane (CH4) and nitrous oxide (N2O) also contribute.

3. **Absorption of Infrared Radiation**: The Earth absorbs sunlight and then re-radiates it as infrared radiation. Greenhouse gases absorb this infrared radiation and re-emit it in all directions, including back towards the Earth’s surface, which leads to warming.

4. **Impact of Increased CO2 Levels**: Human activities, such as burning fossil fuels and deforestation, have significantly increased the concentration of CO2 in the atmosphere. This increase enhances the greenhouse effect, leading to a rise in global temperatures, a phenomenon known as global warming.

5. **Conclusion**: Among the given options, the correct answer is "increase in the temperature due to increase in the carbon dioxide concentration of the atmosphere." This option accurately reflects the primary cause of the greenhouse effect and its role in global warming.