AUTHOR=Marcotullio Peter John , Sorensen Andre TITLE=Editorial: Future urban worlds: Theories, models, scenarios, and observations of urban spatial expansion JOURNAL=Frontiers in Built Environment VOLUME=9 YEAR=2023 URL=https://www.frontiersin.org/journals/built-environment/articles/10.3389/fbuil.2023.1194813 DOI=10.3389/fbuil.2023.1194813 ISSN=2297-3362