AUTHOR=Thomson Laura , Brun Fanny , Braun Matthias , Zemp Michael TITLE=Editorial: Observational Assessments of Glacier Mass Changes at Regional and Global Level JOURNAL=Frontiers in Earth Science VOLUME=8 YEAR=2021 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2020.641710 DOI=10.3389/feart.2020.641710 ISSN=2296-6463