title: Preface to the IUFRO RG7.01 special section "Global Challenges of Air Pollution and Climate Change to Forests".
authors.affiliation: IPSP-CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino Firenze, Italy. Electronic address: elena.paoletti@cnr.it.
authors.forename: Elena
authors.initials: E
authors.lastname: Paoletti
authors.affiliation: ACRI-HE, 260 route du Pin Montard BP234, 06904, Sophia-Antipolis Cedex, France. Electronic address: pierre.sicard@acri-he.fr.
authors.forename: Pierre
authors.initials: P
authors.lastname: Sicard