Supplementary material to "WetCH4: A Machine Learning-based Upscaling of Methane Fluxes of Northern Wetlands during 2016–2022"

GIEMS2 represents the minimum extents of northern wetlands.**GLWD provides a representation of the maximum extent of northern wetlands.***These numbers are derived from CT natural microbial emissions, which include emissions from wetlands, river/lake/pond systems, and possibly wild animals (despite the small amount).