Is the greenhouse effect solely a result of human activity?

• A. Yes
• B. No, it is a natural phenomenon that has been enhanced by human activity.
• C. It is a natural phenomenon with no human influence
• D. It is a myth

Answer: (B)

The greenhouse effect is a natural warming process in which certain gases in Earth’s atmosphere trap heat and keep the surface warmer than it would be otherwise. This baseline warming happens because greenhouse gases like water vapor, carbon dioxide, methane, and nitrous oxide absorb infrared radiation emitted by the Earth and re-radiate some of it back downward, so more heat stays in the lower atmosphere and surface.

Human activities have increased the concentrations of several of these gases, especially carbon dioxide from burning fossil fuels, methane from agriculture and industry, and nitrous oxide from various processes. That extra greenhouse gas buildup strengthens the heat-trapping effect, leading to additional warming beyond the natural level—the enhanced greenhouse effect.

So the best answer reflects that the greenhouse effect is a natural phenomenon that humans have amplified. It’s not solely a human-made effect, nor is it a myth. The increased warming aligns with physical evidence from measurements and climate models showing the impact of higher greenhouse gas levels.