The measure of how much light or radiation is reflected by a surface, expressed as a fraction or percentage. High albedo surfaces like snow and ice reflect most incoming solar energy, while low albedo surfaces like forests and oceans absorb more energy.
From Latin 'albedo' meaning 'whiteness,' derived from 'albus' meaning 'white.' The term was introduced to astronomy and climatology in the 1800s to describe the reflective properties of celestial bodies and Earth's surfaces.
Albedo is nature's thermostat! Arctic ice reflects up to 90% of solar energy, keeping our planet cool, but as ice melts due to climate change, darker ocean water absorbs more heat, creating a feedback loop that accelerates warming - it's like Earth is taking off its white shirt on a hot day.
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