Bad news for Steven Chu, Bjorn Lomborg and
green white jobs.
A new study in the Journal of Climate casts doubt on the latest Great White Hope — the whitewashing of roofs to mitigate climate change.
The researchers say,
White roofs change surface albedo and affect energy demand. A worldwide conversion to white roofs, accounting for their albedo effect only, was calculated to cool population-weighted temperatures by ~0.02 K but to warm the Earth overall by ~0.07 K. White-roof local cooling may also affect energy use, thus emissions, a factor not accounted for here. As such, conclusions here regarding white roofs apply only to the assumptions made.