Warsaw has been accepted by the European Commission to the Mission of 100 Climate Neutral Cities by 2030, along with Kraków, Łódź, Wrocław and Rzeszów. The EC has dedicated an advisor to each of the cities – for Warsaw it is Mr. Bob D’Haeseleer from Belgium. As part of the Mission, on February 2, 2023, we presented a project of expansion & modernization of WtE plant (ZUSOK) in Warsaw, which is an important element in the city’s sustainable development, “greening” energy and recycling. The visit was attended by Mr. Bob D’Haeseleer – Chief Advisor for Warsaw, Climate Neutral City Advisor for Warsaw (Net Zero Cities), Mrs. Olga Krajewska, ICLEI Europe (CAPAcities project), and representatives of the Office of Air Protection and Climate Policy of the City of Warsaw: Mrs. Dorota Zawadzka Stępniak – director, Mrs. Anna Wilimowska – chief specialist, Mr. Marcin Grądzki – head of dpt. The guests got acquainted with the status of the investment carried out at ZUSOK and further plans of the Municipal Cleaning Company for strengthening the climate neutrality of Warsaw. MPO was represented by Mr. Marcin Sadura – deputy director of the ZUSOK expansion project, and Sławomir Cięciara – director of ZUSOK.