select the odd one from the following and select the correct option.

Options

A. During the past decade, the temperature of Earth has increased by `0.6.^@C`.
B. Without the greenhouse effect, the average temperature at the surface of Earth would have been `-18.^@C` rather than the present average of `-15.^@C` .
C. The rise in temperature is leading to deleterious change in the environment and resulting in odd. Climatic changes called El Nino effect.
D. More than one option is correct

Answer

To solve the question of selecting the odd one from the given options related to global warming and greenhouse gases, we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: The question revolves around the effects of global warming and the role of greenhouse gases. We need to analyze each statement provided in the options to identify which one does not align with the established facts about global warming.

2. **Identify Greenhouse Gases and Their Contributions**:
- Carbon Dioxide (CO2): The most significant greenhouse gas contributing to global warming.
- Methane (CH4): Contributes approximately 20% to global warming.
- Chlorofluorocarbons (CFCs): Contributes around 14%.
- Nitrous Oxide (N2O): Contributes about 6%.

3. **Evaluate Each Statement**:
- Check if the statements are true or false based on the known effects of greenhouse gases and global warming.
- For instance, if a statement claims that without the greenhouse effect, the average temperature would be -15 degrees Celsius instead of +15 degrees Celsius, we need to verify this.

4. **Identify the Odd Statement**:
- One statement incorrectly states that without the greenhouse effect, the average temperature would be -18 degrees Celsius instead of the correct average of +15 degrees Celsius. This is a false statement.
- Other statements correctly describe the impact of global warming and its consequences, such as the El Nino effect leading to climatic changes.

5. **Select the Correct Option**:
- Based on the evaluation, the odd statement is the one that incorrectly states the average temperature without the greenhouse effect. Therefore, the correct answer is the option that contains this false statement.

### Final Answer:
The odd one out is the statement that claims the average temperature of the Earth would have been -15 degrees Celsius without the greenhouse effect, which is incorrect.

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