There are important issues to debate about how to modify Earth’s reflectivity, from the local to the global, and from the surface out to space.
Increasing Earth’s reflectivity can counteract Earth’s energy imbalance and slow global warming by reducing the amount of incoming solar radiation absorbed by the Earth [1]. Increasing Earth’s reflectivity has been studied with theory and model simulations showing that it can reduce regional and seasonal climate change [2]. There is an increasingly robust literature and vigorous debate about the methods, costs, benefits, risks, governance, ethics of solar radiation management [3, 4].