Passage Summary: Because snow and ice act like mirrors for the sun's heat, having more of them on the planet should help lower the overall temperature.

Conclusion: Increasing the amount of Earth's surface covered by snow and ice will likely result in a cooler global atmosphere.

Reasoning: Snow and ice reflect significantly more sunlight than land or water, and higher levels of reflected sunlight lead to atmospheric cooling.

Analysis: The argument relies on a straightforward causal chain: more ice leads to more reflection, which leads to more cooling. To strengthen this, we want to ensure that this reflection isn't offset by other factors or that the transition from water/land to ice is the primary driver of temperature change. Look for an answer that confirms the cooling effect of reflection or rules out a scenario where the ice might somehow trap heat in another way.