Maine Greenhouse (GHG) Emissions and Forest Sector Carbon Sequestration, 1990-2050 Maine’s historical (1990-2021) and projected (2022-2050) greenhouse gas (GHG) emissions and forest sector carbon sequestration. GHG emissions include fossil, agricultural, and biogenic (including biomass) sources. Forest sector carbon sequestration includes forest ecosystem and harvested wood products. Data and sources available for download in this Excel