The U.S Department of Energy Informs us:
In some regions, cool roofs are required by legislation. Voluntary programs may also encourage building owners to pursue cool roofs. For example, irrespective of climate, cool roofs qualify for 1 point under the USGBC’s LEED-NC 2009, Sustainable Sites Credit. When cool roofs are optional yet encouraged, the decision should be considered carefully as cool roofs do not perform equally well everywhere.