... Technical Support for Opportunities to Reduce Greenhouse Gas Emissions through Materials and Land Management Practices .A‐1 Opportunities to Reduce Greenhouse Gas Emissions through Materials and Land Management Practices ... The purpose of this document, Opportunities to Reduce Greenhouse Gas Emissions through Materials and Land Management Practices, is to increase the understanding of how materials and land management practices relate to GHG emissions and show a new way of thinking about materials and ... the uses and changes in land types and forests in the U.S., including net emissions from forestland remaining forestland, cropland remaining cropland, land converted to cropland, grassland remaining ...