Earthshine project reports on Earth’s reflectance over the last 16 years

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Of the two primary measurements of the Earth’s albedo, or reflectance, (1) from space [instruments such as ERBE and CERES, whose estimations are made using absolute photometric measurements, which could be affected by any degradation in the instrument while in space] and (2) while the other earth-based using telescopes that observe the so-called earthshine (the light reflected from the Earth to the night-time face of the Moon) the earth-based process which permits more frequent recalibration seem to be more reliable
"The Earth’s albedo, or reflectance, is a fundamental atmospheric parameter having deep implications for temperature and climate change. For that reason, experiments have been performed to monitor it over the past two decades to reveal how it evolves. ... The effect of the albedo is important for life on Earth because it affects the energy budget of the planet: it plays a key role in the process by which the planet achieves an equilibrium between the solar radiation which enters the atmosphere and the radiation emitted as heat into space. The albedo is defined as the fraction of sunlight that the Earth reflects back directly into space, and it varies according to cloud composition, ice, snow, and the nature of the surface onto which the sun’s rays fall. The term comes from the Latin “albus” (white), and a rise or fall in the albedo will have consequences for the planet’s global warming or cooling."

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