EPA has published a final rule providing a three-year exemption for new and modified facilities that burn wood waste and some landfills from the requirement to obtain greenhouse gas (GHG) emissions permits. 76 Fed. Reg. 43,490 (7/20/11). Amending 40 C.F.R. Parts 51, 52, 70, and 71, the final rule defers application of the Clean Air Act’s Prevention of Significant Deterioration (PSD) and Title V permitting requirements to biogenic carbon dioxide (CO2) emissions from bioenergy and other biogenic stationary sources. EPA granted the deferral in response to a petition from the National Alliance of Forest Owners to allow the agency time to further study GHG emissions from biomass such as wood, various crop residues and grass.