**Global Warming**

**Core Concept**
Global warming refers to the long-term rise in the average surface temperature of the Earth due to the increasing levels of greenhouse gases in the atmosphere. This phenomenon is a result of the enhanced greenhouse effect, where the concentration of gases such as carbon dioxide, methane, and water vapor traps heat from the sun, leading to a warming of the planet.

**Why the Correct Answer is Right**
The correct answer is related to the fact that an increase in carbon dioxide levels in the atmosphere is a significant contributor to the enhanced greenhouse effect, leading to global warming. The burning of fossil fuels, deforestation, and other human activities release large amounts of carbon dioxide into the atmosphere, exacerbating the problem.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not provide any information related to global warming. Without a specific statement, it's difficult to evaluate its accuracy.
* **Option B:** This option may seem plausible, but it's actually incorrect because the melting of polar ice caps is a consequence of global warming, not a cause. Global warming leads to the melting of polar ice caps due to the increased temperature.
* **Option C:** This option is incorrect because it's a partial truth. While the concentration of greenhouse gases has increased, it's not the only factor contributing to global warming. Human activities such as deforestation and land-use changes also play a significant role.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that global warming is a complex phenomenon with multiple causes and consequences. It's essential to understand the role of human activities in exacerbating the problem and the need for sustainable practices to mitigate its effects.

**Correct Answer: Not Provided**