Md. Code, Envir. § 2-1204 : ENVIRONMENT — AMBIENT AIR QUALITY CONTROL — GREENHOUSE GAS EMISSIONS REDUCTIONS —1204 - Reduction of Statewide greenhouse gas emissions - 2020 TEXT PDF The State shall reduce statewide greenhouse gas emissions by 25% from 2006 levels by 2020. Md. Code, EN § 2-1204 Amended by 2016 Md. Laws, Ch. 11,Sec. 1, eff. 10/1/2016.