Expert-reviewer of National GHG inventories and National Communication of Annex I Parties to the UNFCCC, waste expert) since 2006; since 2011 - lead reviewer. Since 2015: Expert-reviewer of Biennial Reports and National Communications of Annex I Parties of the UNFCCC. Since 2019: Expert-reviewer of Biennial Update Reports (BUR) of Non-Annex I Parties of the UNFCCC. Expert participation in annual technical reviews of National GHG inventories and National Communications, organized by UNFCCC: from 2007 up to now 13 reviews of NGHGI (as waste sector expert-reviewer and lead reviewer); 3 reviews of National Communications and two Biennial Reports