; and (B) may be used for netting by States or emission sources under Federal programs relating to carbon emissions. (g) Authorization of appropriations There are authorized to be appropriated to carry out this section such sums as are necessary. 3. Material choices in buildings for supplemental greenhouse gas emission reductions in United States (a) Definitions In this section: (1) Eligible building The term eligible building means a nonresidential building used for commercial or State or local government purposes. (2) Eligible product The term eligible product means a commercial or industrial product, such as an intermediate, feedstock, or end product (other than food or feed), that is composed in whole or in part of biological products, including renewable agricultural and forestry materials used as structural building material. (3) Program The term program means the greenhouse gas incentives program established under this section. (4) Secretary The term Secretary means the Secretary of Agriculture. (b) Supplemental greenhouse gas emission reductions in buildings (1) In general The Secretary shall establish a greenhouse gas incentives program to achieve supplemental greenhouse gas emission reductions from material choices in buildings, based on the lifecycle assessment of the building materials. (2) Financial incentive payments The Secretary shall provide to owners of eligible buildings incentive payments for the use of eligible products in buildings for sequestering carbon based on a lifecycle assessment of the structural assemblies, as compared to a model building as a result of using eligible products in substitution for more energy-intensive materials in— (A) new construction