Similar title to Lutz, W. ORCID: https://orcid.org/0000-0001-7975-8145, O'Neill, B., & Scherbov, S. ORCID: https://orcid.org/0000-0002-0881-1073 (2003). Europe's population at a turning point. Science 299 (5615) 1991-1992. 10.1126/science.1080316.