Bringing albedo to the GHG market

A global warming potential of albedo (GWP_A) is proposed, that represents the carbon dioxide emissions equivalent to a 0.01 increase in albedo over 1 m² of horizontal surface. A survey of prior literature suggests GWP_A ≈ −4.2 kgCO₂/m². Taking Los Angeles, CA as a test site for urban global warming mitigation actions, a residential “cool roof” project offers approximately seven times as much radiative forcing benefit from albedo change as from GHG reduction of energy efficiency; and a citywide increase to commercial building roof albedo offers radiative forcing benefit equivalent to the first 6½ years of all commercial sector GHG emission reductions proposed in the City of Los Angeles climate action plan. Discussion explores pathways and challenges to making albedo increases fungible with GHG reductions in GHG markets.