MILAN, ITALY - MAY 21: A gardener plants a young hornbeam as part of the "Forestami" project on May 21, 2021 in Milan, Italy. Forestami is an ambitious urban forestry project aiming to plant 3 millions trees in the Metropolitan City of Milan by 2030, in order to improve air quality and to fight climate change; currently 281,160 shrubs and trees have already been planted.  (Photo by Emanuele Cremaschi/Getty Images)