Describe the Albedo effect and its significance in climate feedback mechanisms.

• A. Reflectivity of surfaces; high albedo reduces warming (ice/snow), low albedo increases absorption and warming.
• B. Albedo is a measure of soil moisture.
• C. Albedo has no climate role.
• D. Albedo is unrelated to climate.

Answer: (A)

Albedo is a measure of how reflective a surface is—the fraction of incoming solar radiation that is reflected back into space. Surfaces with high albedo, like fresh snow and ice, reflect a large portion of sunlight, helping keep those surfaces cooler. Dark surfaces with low albedo, such as forests, oceans, or asphalt, absorb more energy, warming the surface. This difference directly affects the Earth's energy balance and climate feedbacks. When ice and snow retreat and albedo falls, more solar energy is absorbed, accelerating warming in a positive feedback loop. Conversely, bright, reflective conditions can amplify cooling by reflecting more sunlight. Albedo is a fundamental part of how the climate system responds to changes in radiation; it’s not a measure of soil moisture, and it clearly has a climate-significant role.