p51.
John R. Weeks (1978), Population: An Introduction to Concepts and Issues (chapters 6 and 7) discusses factors favouring growth in the world’s population, and the “transitions”, factors that then tend to reduce the growth rate and which could in due course begin to reduce population itself. Leeds study on UK population: Pia Wohland, Phil Rees, Paul Norman, Peter Boden and Martyna Jasinska, “Ethnic Population Projections for the UK and Local Areas, 2001–2051”, Working Paper 10/02, School of Geography, University of Leeds, 2010.