`CO_2` and `H_2 O` absorbs strongly in the infrared region and its
presence in the atmosphere decreases the loss of heat from the
earth by radiation . This global warming is called the greenhouse
effect (other gases , including the oxides of nitrogen
from car exhaust freons from aerosols and refrigerators and
methane from bacteria in the soil and in the rumen cows , also add
to the greenhouse effect ). The concentration of atmospheric `CO_2`
has increased by `10%` . The is resulting in the increase in the mean temperature of the earth by `2. 5^@ C`, varying form `2^@ C` the equator
to `4^@ C` at the poles . This could have dramatic effects on the
climate.
Which of the following is growing at a faster rate than ` CO_2` and
thus responsible for the greenhouse effect ?

Options

A. `CFC`
B. `N_2O`
C. `O_3`
D. `CH_4`

Answer

To solve the question regarding which gas is growing at a faster rate than CO₂ and is responsible for the greenhouse effect, we can follow these steps:

### Step 1: Understand the Greenhouse Effect
The greenhouse effect is a natural process where certain gases in the Earth's atmosphere trap heat, preventing it from escaping back into space. This is essential for maintaining the Earth's temperature but can lead to global warming when the concentration of these gases increases significantly.

**Hint:** Recall the role of greenhouse gases and their impact on Earth's temperature.

### Step 2: Identify the Gases Mentioned
The question provides several gases:
- CFC (Chlorofluorocarbon)
- N₂O (Nitrous oxide)
- O₃ (Ozone)
- CH₄ (Methane)

**Hint:** List out the gases and familiarize yourself with their sources and effects on the greenhouse effect.

### Step 3: Analyze the Growth Rates of the Gases
Research indicates that while CO₂ levels have increased, other gases such as methane (CH₄) and CFCs have been increasing at a faster rate. Methane is released from agricultural practices, landfills, and livestock, while CFCs are released from industrial processes and products like aerosols and refrigerants.

**Hint:** Consider the sources of each gas and their historical growth trends in the atmosphere.

### Step 4: Determine the Gas Responsible for Faster Growth
Among the gases listed, CFCs have been noted for their rapid increase in atmospheric concentration compared to CO₂. They are potent greenhouse gases and contribute significantly to the greenhouse effect.

**Hint:** Think about the industrial applications of CFCs and their regulatory history, which may have contributed to their growth.

### Step 5: Conclusion
Based on the analysis, the gas that is growing at a faster rate than CO₂ and is responsible for the greenhouse effect is **CFC (Chlorofluorocarbon)**.

**Final Answer:** The correct option is **A) CFC (Chlorofluorocarbon)**.